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& lua cheatsheet & Quick Reference</title>
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<a aria-hidden="true" tabindex="-1" href="#lua-备忘清单"><span class="icon icon-link"></span></a>Lua 备忘清单</h1><div class="wrap-body">
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<p>包含最重要概念、函数、方法等的 <a href="http://www.lua.org">Lua</a> 备忘单。 初学者的完整快速参考。</p>
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aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#类型转换">类型转换</a><a aria-hidden="true" class="leve2 tocs-link" data-num="2" href="#条件语句">条件语句</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#运算符-1">运算符</a><a aria-hidden="true" class="leve4 tocs-link" data-num="4" href="#关系运算符">关系运算符</a><a aria-hidden="true" class="leve4 tocs-link" data-num="4" href="#逻辑运算符">逻辑运算符</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#while-循环">while 循环</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#if-语句">if 语句</a><a aria-hidden="true" class="leve4 tocs-link" data-num="4" href="#if--elseif--else">if .. elseif() .. else</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#for-循环">for 循环</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#repeatuntil-循环">repeat...until 循环</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#break">break</a><a aria-hidden="true" class="leve2 tocs-link" data-num="2" href="#函数">函数</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#初始化">初始化</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#返回值">返回值</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#参数">参数</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#多个返回值">多个返回值</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#可变参数">可变参数(...)</a><a aria-hidden="true" class="leve2 tocs-link" data-num="2" href="#字符串">字符串</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#字符串方法">字符串方法</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#正则匹配">正则匹配</a><a aria-hidden="true" class="leve4 tocs-link" data-num="4" href="#match">match</a><a aria-hidden="true" class="leve4 tocs-link" data-num="4" href="#gmatch">gmatch</a><a aria-hidden="true" class="leve2 tocs-link" data-num="2" href="#数学方法">数学方法</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#常用方法">常用方法</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#工具方法">工具方法</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#其它方法">其它方法</a><a aria-hidden="true" class="leve2 tocs-link" data-num="2" href="#table-1">table</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#初始化数组">初始化数组</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#多维数组">多维数组</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#初始化-table">初始化 table</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#table-方法">table 方法</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#迭代器">迭代器</a><a aria-hidden="true" class="leve4 tocs-link" data-num="4" href="#无状态的迭代器">无状态的迭代器</a><a aria-hidden="true" class="leve4 tocs-link" data-num="4" href="#for-循环迭代器">for 循环迭代器</a><a aria-hidden="true" class="leve2 tocs-link" data-num="2" href="#模块">模块</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#定义模块">定义模块</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#导入模块">导入模块</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#私有函数">私有函数</a><a aria-hidden="true" class="leve2 tocs-link" data-num="2" href="#另见">另见</a></div></div><div class="h1wrap-body"><div class="wrap h2body-exist"><div class="wrap-header h2wrap"><h2 id="入门"><a aria-hidden="true" tabindex="-1" href="#入门"><span class="icon icon-link"></span></a>入门</h2><div class="wrap-body">
|
||
</div></div><div class="h2wrap-body"><div class="wrap h3body-exist"><div class="wrap-header h3wrap"><h3 id="下载"><a aria-hidden="true" tabindex="-1" href="#下载"><span class="icon icon-link"></span></a>下载</h3><div class="wrap-body">
|
||
<p>macos 使用 homebrew 下载</p>
|
||
<pre class="language-bash"><code class="language-bash code-highlight"><span class="code-line">$ brew <span class="token function">install</span> lua
|
||
</span></code></pre>
|
||
<h4 id="其它下载方式"><a aria-hidden="true" tabindex="-1" href="#其它下载方式"><span class="icon icon-link"></span></a>其它下载方式</h4>
|
||
<ul>
|
||
<li><a href="https://luabinaries.sourceforge.net/download.html">下载地址</a> <em>(sourceforge.net)</em></li>
|
||
</ul>
|
||
<pre class="language-bash"><code class="language-bash code-highlight"><span class="code-line"><span class="token comment"># 查看 lua 是否安装成功</span>
|
||
</span><span class="code-line">$ lua <span class="token parameter variable">-v</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-exist"><div class="wrap-header h3wrap"><h3 id="hello-world"><a aria-hidden="true" tabindex="-1" href="#hello-world"><span class="icon icon-link"></span></a>hello world</h3><div class="wrap-body">
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token comment">#!/usr/bin/env lua</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span><span class="token string">"Hello World!"</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<h4 id="运行"><a aria-hidden="true" tabindex="-1" href="#运行"><span class="icon icon-link"></span></a>运行</h4>
|
||
<pre class="language-bash"><code class="language-bash code-highlight"><span class="code-line">$ lua ./hello.lua
|
||
</span><span class="code-line"><span class="token comment"># 或者也可以像 bash 脚本一样</span>
|
||
</span><span class="code-line">$ <span class="token function">chmod</span> +x hello.lua
|
||
</span><span class="code-line">./hello.lua
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-exist"><div class="wrap-header h3wrap"><h3 id="注释"><a aria-hidden="true" tabindex="-1" href="#注释"><span class="icon icon-link"></span></a>注释</h3><div class="wrap-body">
|
||
<h4 id="单行注释"><a aria-hidden="true" tabindex="-1" href="#单行注释"><span class="icon icon-link"></span></a>单行注释</h4>
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token comment">-- 以两个减号开始</span>
|
||
</span></code></pre>
|
||
<h4 id="多行注释"><a aria-hidden="true" tabindex="-1" href="#多行注释"><span class="icon icon-link"></span></a>多行注释</h4>
|
||
<p>多行注释以 <code>--[[</code> 开头, 以 <code>]]</code> 结尾</p>
|
||
<pre class="wrap-text "><code class="language-lua code-highlight"><span class="code-line"><span class="token comment">--[[
|
||
</span></span><span class="code-line"><span class="token comment">
|
||
</span></span><span class="code-line"><span class="token comment">]]</span>
|
||
</span></code></pre>
|
||
<!--rehype:className=wrap-text -->
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="type-函数"><a aria-hidden="true" tabindex="-1" href="#type-函数"><span class="icon icon-link"></span></a>type() 函数</h3><div class="wrap-body">
|
||
<p>使用 <code>type()</code> 函数可以判断变量或者值的类型</p>
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span><span class="token function">type</span><span class="token punctuation">(</span><span class="token keyword">true</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token comment">-- boolean</span>
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span><span class="token function">type</span><span class="token punctuation">(</span><span class="token keyword">nil</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token comment">-- nil</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="number"><a aria-hidden="true" tabindex="-1" href="#number"><span class="icon icon-link"></span></a>number</h3><div class="wrap-body">
|
||
<p>Lua 默认只有一种 number 类型 double (双精度) 类型</p>
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span><span class="token number">10</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span><span class="token number">0.3</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>2e <span class="token operator">+</span> <span class="token number">10</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-exist row-span-2"><div class="wrap-header h3wrap"><h3 id="string"><a aria-hidden="true" tabindex="-1" href="#string"><span class="icon icon-link"></span></a>string</h3><div class="wrap-body">
|
||
<!--rehype:wrap-class=row-span-2-->
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token comment">-- 使用 ''</span>
|
||
</span><span class="code-line"><span class="token keyword">local</span> str1 <span class="token operator">=</span> <span class="token string">'str1'</span>
|
||
</span><span class="code-line"><span class="token comment">-- 使用 ""</span>
|
||
</span><span class="code-line"><span class="token keyword">local</span> str2 <span class="token operator">=</span> <span class="token string">"str2"</span>
|
||
</span></code></pre>
|
||
<h4 id=""><a aria-hidden="true" tabindex="-1" href="#"><span class="icon icon-link"></span></a><code>[[]]</code></h4>
|
||
<p>使用 <code>[[]]</code> 跨行表示多个字符串</p>
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token keyword">local</span> html <span class="token operator">=</span> <span class="token string">[[
|
||
</span></span><span class="code-line"><span class="token string"><html>
|
||
</span></span><span class="code-line"><span class="token string"><head></head>
|
||
</span></span><span class="code-line"><span class="token string"><body>
|
||
</span></span><span class="code-line"><span class="token string"> <a href="https://www.twle.cn/">简单编程</a>
|
||
</span></span><span class="code-line"><span class="token string"></body>
|
||
</span></span><span class="code-line"><span class="token string"></html>
|
||
</span></span><span class="code-line"><span class="token string">]]</span>
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>html<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<h4 id="字符串连接"><a aria-hidden="true" tabindex="-1" href="#字符串连接"><span class="icon icon-link"></span></a>字符串连接(<code>..</code>)</h4>
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span><span class="token string">"a"</span> <span class="token operator">..</span> <span class="token string">'b'</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token comment">-- ab</span>
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span><span class="token number">157</span> <span class="token operator">..</span> <span class="token number">428</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token comment">-- 157428</span>
|
||
</span></code></pre>
|
||
<h4 id="字符串长度"><a aria-hidden="true" tabindex="-1" href="#字符串长度"><span class="icon icon-link"></span></a>字符串长度(<code>#</code>)</h4>
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span><span class="token operator">#</span><span class="token string">"string"</span><span class="token punctuation">)</span> <span class="token comment">-- 6</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-exist"><div class="wrap-header h3wrap"><h3 id="table"><a aria-hidden="true" tabindex="-1" href="#table"><span class="icon icon-link"></span></a>table</h3><div class="wrap-body">
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token keyword">local</span> table <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>
|
||
</span></code></pre>
|
||
<h4 id="迭代-table"><a aria-hidden="true" tabindex="-1" href="#迭代-table"><span class="icon icon-link"></span></a>迭代 table</h4>
|
||
<p>默认的初始索引会从 1 开始</p>
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token keyword">local</span> array <span class="token operator">=</span> <span class="token punctuation">{</span> <span class="token string">"apple"</span><span class="token punctuation">,</span> <span class="token string">"pear"</span><span class="token punctuation">,</span> <span class="token string">"orange"</span><span class="token punctuation">,</span> <span class="token string">"grape"</span> <span class="token punctuation">}</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>array<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token comment">-- apple</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token keyword">for</span> k<span class="token punctuation">,</span> v <span class="token keyword">in</span> <span class="token function">pairs</span><span class="token punctuation">(</span>array<span class="token punctuation">)</span> <span class="token keyword">do</span>
|
||
</span><span class="code-line"> <span class="token function">print</span><span class="token punctuation">(</span>k <span class="token operator">..</span> <span class="token string">" : "</span> <span class="token operator">..</span> v<span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">end</span>
|
||
</span><span class="code-line"><span class="token comment">-- 1 : apple</span>
|
||
</span><span class="code-line"><span class="token comment">-- 2 : pear</span>
|
||
</span><span class="code-line"><span class="token comment">-- 3 : orange</span>
|
||
</span><span class="code-line"><span class="token comment">-- 4 : grape</span>
|
||
</span></code></pre>
|
||
<h4 id="指定键"><a aria-hidden="true" tabindex="-1" href="#指定键"><span class="icon icon-link"></span></a>指定键</h4>
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token keyword">local</span> array <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>
|
||
</span><span class="code-line">array<span class="token punctuation">.</span>one <span class="token operator">=</span> <span class="token string">"apple"</span>
|
||
</span><span class="code-line">array<span class="token punctuation">[</span><span class="token string">"two"</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token string">"peach"</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>array<span class="token punctuation">.</span>one<span class="token punctuation">)</span> <span class="token comment">-- apple</span>
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>array<span class="token punctuation">.</span>two<span class="token punctuation">)</span> <span class="token comment">-- peach</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-exist"><div class="wrap-header h3wrap"><h3 id="变量"><a aria-hidden="true" tabindex="-1" href="#变量"><span class="icon icon-link"></span></a>变量</h3><div class="wrap-body">
|
||
<h4 id="默认值"><a aria-hidden="true" tabindex="-1" href="#默认值"><span class="icon icon-link"></span></a>默认值</h4>
|
||
<p>变量的默认值均是 nil</p>
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token comment">#!/usr/bin/env lua</span>
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>b<span class="token punctuation">)</span> <span class="token comment">-- nil</span>
|
||
</span></code></pre>
|
||
<h4 id="全局和局部变量"><a aria-hidden="true" tabindex="-1" href="#全局和局部变量"><span class="icon icon-link"></span></a>全局和局部变量</h4>
|
||
<p>Lua 中的变量全是全局变量，那怕是语句块或是函数里，除非用 local 显式声明为局部变量</p>
|
||
<pre class="wrap-text "><code class="language-lua code-highlight"><span class="code-line"><span class="token comment">#!/usr/bin/env lua</span>
|
||
</span><span class="code-line"><span class="token keyword">function</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"> <span class="token keyword">local</span> b <span class="token operator">=</span> <span class="token number">12</span>
|
||
</span><span class="code-line"> a <span class="token operator">=</span> <span class="token number">23</span>
|
||
</span><span class="code-line"><span class="token keyword">end</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span> <span class="token comment">-- 23</span>
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>b<span class="token punctuation">)</span> <span class="token comment">-- nil</span>
|
||
</span></code></pre>
|
||
<!--rehype:className=wrap-text -->
|
||
</div></div></div><div class="wrap h3body-exist row-span-2"><div class="wrap-header h3wrap"><h3 id="赋值"><a aria-hidden="true" tabindex="-1" href="#赋值"><span class="icon icon-link"></span></a>赋值</h3><div class="wrap-body">
|
||
<!--rehype:wrap-class=row-span-2-->
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line">a <span class="token operator">=</span> <span class="token string">"hello "</span> <span class="token operator">..</span> <span class="token string">"world"</span> <span class="token comment">-- 改变 变量</span>
|
||
</span><span class="code-line">t<span class="token punctuation">.</span>n <span class="token operator">=</span> t<span class="token punctuation">.</span>n <span class="token operator">+</span> <span class="token number">1</span> <span class="token comment">-- 改变 table</span>
|
||
</span></code></pre>
|
||
<hr>
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token comment">-- 给多个变量赋值</span>
|
||
</span><span class="code-line">a<span class="token punctuation">,</span> b <span class="token operator">=</span> <span class="token number">10</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token operator">*</span>a <span class="token comment">--> a=10; b=20</span>
|
||
</span></code></pre>
|
||
<h4 id="交换变量"><a aria-hidden="true" tabindex="-1" href="#交换变量"><span class="icon icon-link"></span></a>交换变量</h4>
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token keyword">local</span> x<span class="token punctuation">,</span> y <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">3</span>
|
||
</span><span class="code-line">x<span class="token punctuation">,</span> y <span class="token operator">=</span> y<span class="token punctuation">,</span> x
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>x<span class="token punctuation">,</span> y<span class="token punctuation">)</span> <span class="token comment">-- 3, 1</span>
|
||
</span></code></pre>
|
||
<hr>
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token keyword">local</span> tab <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>
|
||
</span><span class="code-line">tab<span class="token punctuation">.</span>one <span class="token operator">=</span> <span class="token number">2</span>
|
||
</span><span class="code-line">tab<span class="token punctuation">.</span>two <span class="token operator">=</span> <span class="token number">1</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line">tab<span class="token punctuation">[</span><span class="token string">"one"</span><span class="token punctuation">]</span><span class="token punctuation">,</span> tab<span class="token punctuation">[</span><span class="token string">"two"</span><span class="token punctuation">]</span> <span class="token operator">=</span> tab<span class="token punctuation">.</span>two<span class="token punctuation">,</span> tab<span class="token punctuation">.</span>one
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>tab<span class="token punctuation">.</span>one<span class="token punctuation">,</span> tab<span class="token punctuation">.</span>two<span class="token punctuation">)</span> <span class="token comment">-- 1 2</span>
|
||
</span></code></pre>
|
||
<h4 id="赋值个数不一致"><a aria-hidden="true" tabindex="-1" href="#赋值个数不一致"><span class="icon icon-link"></span></a>赋值个数不一致</h4>
|
||
<ul class="style-round">
|
||
<li>
|
||
<p>如果变量个数<strong>大于</strong>值的个数，按变量个数补足 nil</p>
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line">a<span class="token punctuation">,</span> b<span class="token punctuation">,</span> c <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">3</span>
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>a<span class="token punctuation">,</span>b<span class="token punctuation">,</span>c<span class="token punctuation">)</span> <span class="token comment">--> 1 3 nil</span>
|
||
</span></code></pre>
|
||
</li>
|
||
<li>
|
||
<p>如果变量个数<strong>小于</strong>值的个数，多余的值会被忽略</p>
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line">a <span class="token operator">=</span> <span class="token number">1</span>
|
||
</span><span class="code-line"><span class="token keyword">local</span> a<span class="token punctuation">,</span> b <span class="token operator">=</span> a<span class="token punctuation">,</span> a <span class="token operator">+</span> <span class="token number">1</span><span class="token punctuation">,</span> a <span class="token operator">+</span> <span class="token number">2</span>
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>a<span class="token punctuation">,</span> b<span class="token punctuation">)</span> <span class="token comment">--> 1 2</span>
|
||
</span></code></pre>
|
||
</li>
|
||
</ul>
|
||
<!--rehype:className=style-round-->
|
||
<!--rehype:className=wrap-text -->
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="运算符"><a aria-hidden="true" tabindex="-1" href="#运算符"><span class="icon icon-link"></span></a>运算符</h3><div class="wrap-body">
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<table><thead><tr><th align="left">:-</th><th align="left">:-</th></tr></thead><tbody><tr><td align="left">+</td><td align="left">加法</td></tr><tr><td align="left">-</td><td align="left">减法</td></tr><tr><td align="left">*</td><td align="left">乘法</td></tr><tr><td align="left">/</td><td align="left">除法</td></tr><tr><td align="left">%</td><td align="left">取余，求出除法的余数</td></tr><tr><td align="left">^</td><td align="left">乘幂，计算次方</td></tr><tr><td align="left">-</td><td align="left">负号，取负值</td></tr></tbody></table>
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token keyword">local</span> a<span class="token punctuation">,</span> b <span class="token operator">=</span> <span class="token number">4</span><span class="token punctuation">,</span> <span class="token number">3</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>a <span class="token operator">+</span> b<span class="token punctuation">)</span> <span class="token comment">-- 7</span>
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>a <span class="token operator">-</span> b<span class="token punctuation">)</span> <span class="token comment">-- 1</span>
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>a <span class="token operator">/</span> b<span class="token punctuation">)</span> <span class="token comment">-- 1.3333333333333</span>
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>a <span class="token operator">*</span> b<span class="token punctuation">)</span> <span class="token comment">-- 12</span>
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>a <span class="token operator">%</span> b<span class="token punctuation">)</span> <span class="token comment">-- 1</span>
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>a <span class="token operator">^</span> b<span class="token punctuation">)</span> <span class="token comment">-- 64.0</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="类型转换"><a aria-hidden="true" tabindex="-1" href="#类型转换"><span class="icon icon-link"></span></a>类型转换</h3><div class="wrap-body">
|
||
<ul class="style-round">
|
||
<li>
|
||
<p>在算术运算中，string 类型会尝试自动转换为 number 时</p>
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token keyword">local</span> a<span class="token punctuation">,</span> b<span class="token punctuation">,</span> c <span class="token operator">=</span> <span class="token string">"str"</span><span class="token punctuation">,</span> <span class="token string">"1"</span><span class="token punctuation">,</span> <span class="token string">"2"</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">-- print(a + b) -- error</span>
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>b <span class="token operator">+</span> c<span class="token punctuation">)</span> <span class="token comment">-- 3</span>
|
||
</span></code></pre>
|
||
</li>
|
||
<li>
|
||
<p>number 类型使用 <code>..</code> 会自动转换为 string</p>
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token keyword">local</span> a<span class="token punctuation">,</span> b <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span>
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span><span class="token function">type</span><span class="token punctuation">(</span>a <span class="token operator">..</span> b<span class="token punctuation">)</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
</li>
|
||
<li>
|
||
<p>其它方式的转换</p>
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span><span class="token function">type</span><span class="token punctuation">(</span><span class="token function">tostring</span><span class="token punctuation">(</span><span class="token number">12</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token comment">-- string</span>
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span><span class="token function">type</span><span class="token punctuation">(</span><span class="token function">tonumber</span><span class="token punctuation">(</span><span class="token string">"12"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token comment">-- number</span>
|
||
</span></code></pre>
|
||
</li>
|
||
</ul>
|
||
<!--rehype:className=style-round-->
|
||
<!--rehype:className=wrap-text -->
|
||
</div></div></div></div></div><div class="wrap h2body-exist"><div class="wrap-header h2wrap"><h2 id="条件语句"><a aria-hidden="true" tabindex="-1" href="#条件语句"><span class="icon icon-link"></span></a>条件语句</h2><div class="wrap-body">
|
||
</div></div><div class="h2wrap-body"><div class="wrap h3body-exist row-span-2"><div class="wrap-header h3wrap"><h3 id="运算符-1"><a aria-hidden="true" tabindex="-1" href="#运算符-1"><span class="icon icon-link"></span></a>运算符</h3><div class="wrap-body">
|
||
<!--rehype:wrap-class=row-span-2-->
|
||
<h4 id="关系运算符"><a aria-hidden="true" tabindex="-1" href="#关系运算符"><span class="icon icon-link"></span></a>关系运算符</h4>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<table class="show-header"><thead><tr><th align="left">符号</th><th align="left">含义</th></tr></thead><tbody><tr><td align="left"><code>==</code></td><td align="left">等于</td></tr><tr><td align="left"><code>~=</code></td><td align="left">不等于</td></tr><tr><td align="left"><code>></code></td><td align="left">大于</td></tr><tr><td align="left"><code><</code></td><td align="left">小于</td></tr><tr><td align="left"><code>>=</code></td><td align="left">大于等于</td></tr><tr><td align="left"><code><=</code></td><td align="left">小于等于</td></tr></tbody></table>
|
||
<!--rehype:className=show-header-->
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token keyword">local</span> a<span class="token punctuation">,</span> b <span class="token operator">=</span> <span class="token number">4</span><span class="token punctuation">,</span> <span class="token number">3</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>a <span class="token operator"><</span> b<span class="token punctuation">)</span> <span class="token comment">-- false</span>
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>a <span class="token operator"><=</span> b<span class="token punctuation">)</span> <span class="token comment">-- false</span>
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>a <span class="token operator">==</span> b<span class="token punctuation">)</span> <span class="token comment">-- false</span>
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>a <span class="token operator">~=</span> b<span class="token punctuation">)</span> <span class="token comment">-- true</span>
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>a <span class="token operator">></span> b<span class="token punctuation">)</span> <span class="token comment">-- true</span>
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>a <span class="token operator">>=</span> b<span class="token punctuation">)</span><span class="token comment">-- true</span>
|
||
</span></code></pre>
|
||
<h4 id="逻辑运算符"><a aria-hidden="true" tabindex="-1" href="#逻辑运算符"><span class="icon icon-link"></span></a>逻辑运算符</h4>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<table class="show-header"><thead><tr><th align="left">符号</th><th align="left">含义</th></tr></thead><tbody><tr><td align="left"><code>and</code></td><td align="left">逻辑与</td></tr><tr><td align="left"><code>or</code></td><td align="left">逻辑或操作符</td></tr><tr><td align="left"><code>not</code></td><td align="left">逻辑非操作符</td></tr></tbody></table>
|
||
<!--rehype:className=show-header-->
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token keyword">local</span> a<span class="token punctuation">,</span> b <span class="token operator">=</span> <span class="token keyword">true</span><span class="token punctuation">,</span> <span class="token keyword">false</span>
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>a <span class="token keyword">and</span> b<span class="token punctuation">)</span> <span class="token comment">-- false</span>
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>a <span class="token keyword">and</span> <span class="token keyword">not</span> b<span class="token punctuation">)</span> <span class="token comment">-- true</span>
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>a <span class="token keyword">or</span> b<span class="token punctuation">)</span> <span class="token comment">-- true</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="while-循环"><a aria-hidden="true" tabindex="-1" href="#while-循环"><span class="icon icon-link"></span></a>while 循环</h3><div class="wrap-body">
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token keyword">local</span> num <span class="token operator">=</span> <span class="token number">1</span>
|
||
</span><span class="code-line"><span class="token keyword">while</span> <span class="token punctuation">(</span>num <span class="token operator"><</span> <span class="token number">5</span><span class="token punctuation">)</span> <span class="token keyword">do</span>
|
||
</span><span class="code-line"> <span class="token function">print</span><span class="token punctuation">(</span><span class="token string">"num 的值为:"</span><span class="token punctuation">,</span> num<span class="token punctuation">)</span>
|
||
</span><span class="code-line"> num <span class="token operator">=</span> num <span class="token operator">+</span> <span class="token number">1</span>
|
||
</span><span class="code-line"><span class="token keyword">end</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-exist row-span-2"><div class="wrap-header h3wrap"><h3 id="if-语句"><a aria-hidden="true" tabindex="-1" href="#if-语句"><span class="icon icon-link"></span></a>if 语句</h3><div class="wrap-body">
|
||
<!--rehype:wrap-class=row-span-2-->
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token keyword">if</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">then</span>
|
||
</span><span class="code-line"> <span class="token function">print</span><span class="token punctuation">(</span><span class="token string">"0 为 true"</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">end</span>
|
||
</span></code></pre>
|
||
<h4 id="if--elseif--else"><a aria-hidden="true" tabindex="-1" href="#if--elseif--else"><span class="icon icon-link"></span></a>if .. elseif() .. else</h4>
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token keyword">local</span> age <span class="token operator">=</span> <span class="token number">27</span><span class="token punctuation">;</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token keyword">if</span> <span class="token punctuation">(</span>age <span class="token operator"><</span> <span class="token number">18</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">then</span>
|
||
</span><span class="code-line"> <span class="token function">print</span><span class="token punctuation">(</span><span class="token string">"age 小于 18"</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">elseif</span> <span class="token punctuation">(</span>age <span class="token operator"><</span> <span class="token number">25</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">then</span>
|
||
</span><span class="code-line"> <span class="token function">print</span><span class="token punctuation">(</span><span class="token string">"age 小于 25"</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">elseif</span> <span class="token punctuation">(</span>age <span class="token operator"><</span> <span class="token number">30</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">then</span>
|
||
</span><span class="code-line"> <span class="token function">print</span><span class="token punctuation">(</span><span class="token string">"age 小于 30"</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">else</span>
|
||
</span><span class="code-line"> <span class="token function">print</span><span class="token punctuation">(</span><span class="token string">"age 大于 30"</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">end</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span><span class="token string">"age 的值为 :"</span><span class="token punctuation">,</span> age<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<p><red>注意: </red><code>Lua</code> 中 <code>0</code> 为 <code>true</code>，但是 <code>Lua</code> 中的 <code>nil</code> 可以当作 <code>false</code></p>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="for-循环"><a aria-hidden="true" tabindex="-1" href="#for-循环"><span class="icon icon-link"></span></a>for 循环</h3><div class="wrap-body">
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token keyword">for</span> i <span class="token operator">=</span> <span class="token number">10</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token operator">-</span><span class="token number">1</span> <span class="token keyword">do</span>
|
||
</span><span class="code-line"> <span class="token function">print</span><span class="token punctuation">(</span>i<span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">end</span>
|
||
</span></code></pre>
|
||
<ul>
|
||
<li>lua 中的 for 循环从参数 1 变化到参数 2，每次变化以参数 3 为步长递增 i，并执行一次表达式</li>
|
||
<li>参数三，是可选的，如果不指定，默认是 1</li>
|
||
<li>参数二只会在一开始求值，其后不会再进行运算</li>
|
||
</ul>
|
||
<pre class="style-round wrap-text"><code class="language-lua code-highlight"><span class="code-line"><span class="token keyword">local</span> f <span class="token operator">=</span> <span class="token keyword">function</span><span class="token punctuation">(</span>x<span class="token punctuation">)</span>
|
||
</span><span class="code-line"> <span class="token function">print</span><span class="token punctuation">(</span><span class="token string">"in f(x) "</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"> <span class="token keyword">return</span> x <span class="token operator">*</span> <span class="token number">2</span>
|
||
</span><span class="code-line"><span class="token keyword">end</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token keyword">for</span> i <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token function">f</span><span class="token punctuation">(</span><span class="token number">5</span><span class="token punctuation">)</span> <span class="token keyword">do</span>
|
||
</span><span class="code-line"> <span class="token function">print</span><span class="token punctuation">(</span>i<span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">end</span>
|
||
</span></code></pre>
|
||
<!--rehype:className=style-round wrap-text-->
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="repeatuntil-循环"><a aria-hidden="true" tabindex="-1" href="#repeatuntil-循环"><span class="icon icon-link"></span></a>repeat...until 循环</h3><div class="wrap-body">
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token keyword">local</span> num <span class="token operator">=</span> <span class="token number">11</span>
|
||
</span><span class="code-line"><span class="token keyword">repeat</span>
|
||
</span><span class="code-line"> <span class="token function">print</span><span class="token punctuation">(</span><span class="token string">"num 的值为: "</span><span class="token punctuation">,</span> num<span class="token punctuation">)</span>
|
||
</span><span class="code-line"> num <span class="token operator">=</span> num <span class="token operator">+</span> <span class="token number">1</span>
|
||
</span><span class="code-line"><span class="token keyword">until</span> <span class="token punctuation">(</span>num <span class="token operator">></span> <span class="token number">10</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token comment">-- num 的值为：11</span>
|
||
</span></code></pre>
|
||
<p><code>repeat...until</code> 循环的条件语句在当前循环结束后判断</p>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="break"><a aria-hidden="true" tabindex="-1" href="#break"><span class="icon icon-link"></span></a>break</h3><div class="wrap-body">
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token keyword">local</span> num <span class="token operator">=</span> <span class="token number">11</span>
|
||
</span><span class="code-line"><span class="token keyword">repeat</span>
|
||
</span><span class="code-line"> <span class="token function">print</span><span class="token punctuation">(</span><span class="token string">"num 的值为: "</span><span class="token punctuation">,</span> num<span class="token punctuation">)</span>
|
||
</span><span class="code-line"> num <span class="token operator">=</span> num <span class="token operator">+</span> <span class="token number">1</span>
|
||
</span><span class="code-line"> <span class="token keyword">if</span> <span class="token punctuation">(</span>num <span class="token operator">></span> <span class="token number">15</span><span class="token punctuation">)</span> <span class="token keyword">then</span>
|
||
</span><span class="code-line"> <span class="token keyword">break</span>
|
||
</span><span class="code-line"> <span class="token keyword">end</span>
|
||
</span><span class="code-line"><span class="token keyword">until</span> <span class="token punctuation">(</span>num <span class="token operator">></span> <span class="token number">20</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
</div></div></div></div></div><div class="wrap h2body-exist"><div class="wrap-header h2wrap"><h2 id="函数"><a aria-hidden="true" tabindex="-1" href="#函数"><span class="icon icon-link"></span></a>函数</h2><div class="wrap-body">
|
||
</div></div><div class="h2wrap-body"><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="初始化"><a aria-hidden="true" tabindex="-1" href="#初始化"><span class="icon icon-link"></span></a>初始化</h3><div class="wrap-body">
|
||
<p>像变量一样，如果加上 <code>local</code> 那么就是局部函数</p>
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token keyword">local</span> <span class="token keyword">function</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"> <span class="token function">print</span><span class="token punctuation">(</span><span class="token string">"这是一个局部函数"</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">end</span>
|
||
</span></code></pre>
|
||
<hr>
|
||
<p>你也可以将函数赋值给一个变量</p>
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token keyword">local</span> main <span class="token operator">=</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"> <span class="token function">print</span><span class="token punctuation">(</span><span class="token string">"这是一个局部函数"</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">end</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="返回值"><a aria-hidden="true" tabindex="-1" href="#返回值"><span class="icon icon-link"></span></a>返回值</h3><div class="wrap-body">
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token keyword">local</span> <span class="token keyword">function</span> <span class="token function">min</span><span class="token punctuation">(</span>a<span class="token punctuation">,</span> b<span class="token punctuation">)</span>
|
||
</span><span class="code-line"> <span class="token keyword">if</span> <span class="token punctuation">(</span>a <span class="token operator"><</span> b<span class="token punctuation">)</span> <span class="token keyword">then</span>
|
||
</span><span class="code-line"> <span class="token keyword">return</span> a
|
||
</span><span class="code-line"> <span class="token keyword">else</span>
|
||
</span><span class="code-line"> <span class="token keyword">return</span> b
|
||
</span><span class="code-line"> <span class="token keyword">end</span>
|
||
</span><span class="code-line"><span class="token keyword">end</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span><span class="token function">min</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="参数"><a aria-hidden="true" tabindex="-1" href="#参数"><span class="icon icon-link"></span></a>参数</h3><div class="wrap-body">
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token keyword">local</span> p <span class="token operator">=</span> <span class="token keyword">function</span><span class="token punctuation">(</span>res<span class="token punctuation">)</span>
|
||
</span><span class="code-line"> <span class="token function">print</span><span class="token punctuation">(</span><span class="token string">"打印自己的风格"</span><span class="token punctuation">,</span> res<span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">end</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token keyword">local</span> <span class="token keyword">function</span> <span class="token function">main</span><span class="token punctuation">(</span>a<span class="token punctuation">,</span> b<span class="token punctuation">,</span> p<span class="token punctuation">)</span>
|
||
</span><span class="code-line"> <span class="token function">p</span><span class="token punctuation">(</span>a <span class="token operator">+</span> b<span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">end</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token function">main</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> p<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="多个返回值"><a aria-hidden="true" tabindex="-1" href="#多个返回值"><span class="icon icon-link"></span></a>多个返回值</h3><div class="wrap-body">
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token keyword">local</span> <span class="token keyword">function</span> <span class="token function">min</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span>
|
||
</span><span class="code-line"> <span class="token keyword">local</span> sum <span class="token operator">=</span> <span class="token number">0</span>
|
||
</span><span class="code-line"> <span class="token keyword">local</span> factorial <span class="token operator">=</span> <span class="token number">1</span>
|
||
</span><span class="code-line"> <span class="token keyword">for</span> i<span class="token punctuation">,</span> v <span class="token keyword">in</span> <span class="token function">pairs</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span> <span class="token keyword">do</span>
|
||
</span><span class="code-line"> sum <span class="token operator">=</span> sum <span class="token operator">+</span> v
|
||
</span><span class="code-line"> factorial <span class="token operator">=</span> factorial <span class="token operator">*</span> v
|
||
</span><span class="code-line"> <span class="token keyword">end</span>
|
||
</span><span class="code-line"> <span class="token keyword">return</span> sum<span class="token punctuation">,</span> factorial
|
||
</span><span class="code-line"><span class="token keyword">end</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token keyword">local</span> a<span class="token punctuation">,</span> b <span class="token operator">=</span> <span class="token function">min</span><span class="token punctuation">(</span><span class="token punctuation">{</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">4</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>a<span class="token punctuation">,</span> b<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="可变参数"><a aria-hidden="true" tabindex="-1" href="#可变参数"><span class="icon icon-link"></span></a>可变参数(<code>...</code>)</h3><div class="wrap-body">
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token keyword">local</span> <span class="token keyword">function</span> <span class="token function">average</span><span class="token punctuation">(</span><span class="token punctuation">...</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"> <span class="token keyword">local</span> result <span class="token operator">=</span> <span class="token number">0</span>
|
||
</span><span class="code-line"> <span class="token keyword">local</span> arg <span class="token operator">=</span> <span class="token punctuation">{</span> <span class="token punctuation">...</span> <span class="token punctuation">}</span>
|
||
</span><span class="code-line"> <span class="token keyword">for</span> i<span class="token punctuation">,</span> v <span class="token keyword">in</span> <span class="token function">ipairs</span><span class="token punctuation">(</span>arg<span class="token punctuation">)</span> <span class="token keyword">do</span>
|
||
</span><span class="code-line"> result <span class="token operator">=</span> result <span class="token operator">+</span> v
|
||
</span><span class="code-line"> <span class="token keyword">end</span>
|
||
</span><span class="code-line"> <span class="token keyword">return</span> result <span class="token operator">/</span> <span class="token operator">#</span>arg
|
||
</span><span class="code-line"><span class="token keyword">end</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span><span class="token string">"平均值为"</span><span class="token punctuation">,</span> <span class="token function">average</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">5</span><span class="token punctuation">,</span> <span class="token number">7</span><span class="token punctuation">,</span> <span class="token number">9</span><span class="token punctuation">,</span> <span class="token number">11</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
</div></div></div></div></div><div class="wrap h2body-exist"><div class="wrap-header h2wrap"><h2 id="字符串"><a aria-hidden="true" tabindex="-1" href="#字符串"><span class="icon icon-link"></span></a>字符串</h2><div class="wrap-body">
|
||
</div></div><div class="h2wrap-body"><div class="wrap h3body-not-exist col-span-2"><div class="wrap-header h3wrap"><h3 id="字符串方法"><a aria-hidden="true" tabindex="-1" href="#字符串方法"><span class="icon icon-link"></span></a>字符串方法</h3><div class="wrap-body">
|
||
<!--rehype:wrap-class=col-span-2-->
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token comment">-- 全部转换为大写</span>
|
||
</span><span class="code-line">string<span class="token punctuation">.</span><span class="token function">upper</span><span class="token punctuation">(</span><span class="token string">"str"</span><span class="token punctuation">)</span> <span class="token comment">-- STR</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">-- 全部转换为小写</span>
|
||
</span><span class="code-line">string<span class="token punctuation">.</span><span class="token function">lower</span><span class="token punctuation">(</span><span class="token string">"STR"</span><span class="token punctuation">)</span> <span class="token comment">-- str</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">-- 指定替换的字符串个数, 最后一个参数可选，默认是全部替换</span>
|
||
</span><span class="code-line">string<span class="token punctuation">.</span><span class="token function">gsub</span><span class="token punctuation">(</span><span class="token string">"aaaa"</span><span class="token punctuation">,</span> <span class="token string">"a"</span><span class="token punctuation">,</span> <span class="token string">"b"</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">)</span> <span class="token comment">-- bbba 3</span>
|
||
</span><span class="code-line">string<span class="token punctuation">.</span><span class="token function">gsub</span><span class="token punctuation">(</span><span class="token string">"Today is 29/01/2019"</span><span class="token punctuation">,</span> <span class="token string">"%d%d/%d%d/%d%d%d%d"</span><span class="token punctuation">,</span> <span class="token string">"good day."</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token comment">-- Today is a good day. 1</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">-- 查找第一个匹配的字符串，第三个参数可以提供开始查找的位置，默认从 1 开始</span>
|
||
</span><span class="code-line"><span class="token comment">-- 如果未找到，则返回 nil</span>
|
||
</span><span class="code-line">string<span class="token punctuation">.</span><span class="token function">find</span><span class="token punctuation">(</span><span class="token string">"referference"</span><span class="token punctuation">,</span> <span class="token string">"fer"</span><span class="token punctuation">)</span> <span class="token comment">-- 3 5</span>
|
||
</span><span class="code-line">string<span class="token punctuation">.</span><span class="token function">find</span><span class="token punctuation">(</span><span class="token string">"Today is 29/01/2021"</span><span class="token punctuation">,</span> <span class="token string">"%d%d/%d%d/%d%d%d%d"</span><span class="token punctuation">)</span> <span class="token comment">-- 10 19</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">-- 字符串反转</span>
|
||
</span><span class="code-line">string<span class="token punctuation">.</span><span class="token function">reverse</span><span class="token punctuation">(</span><span class="token string">"fw"</span><span class="token punctuation">)</span> <span class="token comment">-- wf</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">-- 格式化字符串</span>
|
||
</span><span class="code-line">string<span class="token punctuation">.</span><span class="token function">format</span><span class="token punctuation">(</span><span class="token string">"value:%c"</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">)</span> <span class="token comment">-- value:a</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">-- 转换字符并拼接</span>
|
||
</span><span class="code-line">string<span class="token punctuation">.</span><span class="token function">char</span><span class="token punctuation">(</span><span class="token number">97</span><span class="token punctuation">,</span><span class="token number">98</span><span class="token punctuation">,</span><span class="token number">99</span><span class="token punctuation">,</span><span class="token number">100</span><span class="token punctuation">)</span> <span class="token comment">-- abcd</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">-- 将字符转化为整数值。 int 用来指定某个字符，默认第一个字符</span>
|
||
</span><span class="code-line">string<span class="token punctuation">.</span><span class="token function">byte</span><span class="token punctuation">(</span><span class="token string">"ABCD"</span><span class="token punctuation">,</span><span class="token number">4</span><span class="token punctuation">)</span> <span class="token comment">-- 68</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">-- 计算字符串长度</span>
|
||
</span><span class="code-line">string<span class="token punctuation">.</span><span class="token function">len</span><span class="token punctuation">(</span><span class="token string">"abc"</span><span class="token punctuation">)</span> <span class="token comment">-- 3</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">-- 返回字符串的 n 个拷贝</span>
|
||
</span><span class="code-line">string<span class="token punctuation">.</span><span class="token function">rep</span><span class="token punctuation">(</span><span class="token string">"fw"</span><span class="token punctuation">,</span> n<span class="token punctuation">)</span> <span class="token comment">-- fwfw</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">-- 剪切字符串，第三个参数可选，默认是字符串长度</span>
|
||
</span><span class="code-line">string<span class="token punctuation">.</span><span class="token function">sub</span><span class="token punctuation">(</span><span class="token string">"referference"</span><span class="token punctuation">,</span> <span class="token number">5</span><span class="token punctuation">,</span> <span class="token number">6</span><span class="token punctuation">)</span> <span class="token comment">-- rf</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-exist"><div class="wrap-header h3wrap"><h3 id="正则匹配"><a aria-hidden="true" tabindex="-1" href="#正则匹配"><span class="icon icon-link"></span></a>正则匹配</h3><div class="wrap-body">
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<table class="left-align"><thead><tr><th align="left">:-</th><th align="left">:-</th></tr></thead><tbody><tr><td align="left"><code>%a</code></td><td align="left">与任何字母配对</td></tr><tr><td align="left"><code>%c</code></td><td align="left">与任何控制符配对(例如\n)</td></tr><tr><td align="left"><code>%d</code></td><td align="left">与任何数字配对</td></tr><tr><td align="left"><code>%l</code></td><td align="left">与任何小写字母配对</td></tr><tr><td align="left"><code>%p</code></td><td align="left">与任何标点(punctuation)配对</td></tr><tr><td align="left"><code>%s</code></td><td align="left">与空白字符配对</td></tr><tr><td align="left"><code>%u</code></td><td align="left">与任何大写字母配对</td></tr><tr><td align="left"><code>%w</code></td><td align="left">与任何字母/数字配对</td></tr><tr><td align="left"><code>%x</code></td><td align="left">与任何十六进制数配对</td></tr><tr><td align="left"><code>%z</code></td><td align="left">与任何代表0的字符配对</td></tr></tbody></table>
|
||
<!--rehype:className=left-align-->
|
||
<h4 id="match"><a aria-hidden="true" tabindex="-1" href="#match"><span class="icon icon-link"></span></a>match</h4>
|
||
<p>第三个参数可选，默认从 1 开始。如果没有捕获组返回整个字符串，匹配失败返回 nil</p>
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line">string<span class="token punctuation">.</span><span class="token function">match</span><span class="token punctuation">(</span>
|
||
</span><span class="code-line"> <span class="token string">"I have 2 questions for you."</span><span class="token punctuation">,</span>
|
||
</span><span class="code-line"> <span class="token string">"(%d+) (%a+) "</span>
|
||
</span><span class="code-line"><span class="token punctuation">)</span> <span class="token comment">-- 2 questions</span>
|
||
</span></code></pre>
|
||
<h4 id="gmatch"><a aria-hidden="true" tabindex="-1" href="#gmatch"><span class="icon icon-link"></span></a>gmatch</h4>
|
||
<p>返回一个迭代器函数，每次调用迭代器函数，如果参数 pattern 描述的字符串没有找到，迭代函数返回nil</p>
|
||
<pre class="style-round wrap-text"><code class="language-lua code-highlight"><span class="code-line"><span class="token keyword">for</span> world <span class="token keyword">in</span> string<span class="token punctuation">.</span><span class="token function">gmatch</span><span class="token punctuation">(</span><span class="token string">"I have 2 questions for you."</span><span class="token punctuation">,</span> <span class="token string">"%a+"</span><span class="token punctuation">)</span> <span class="token keyword">do</span>
|
||
</span><span class="code-line"> <span class="token function">print</span><span class="token punctuation">(</span>world<span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">end</span>
|
||
</span><span class="code-line"><span class="token comment">-- I</span>
|
||
</span><span class="code-line"><span class="token comment">-- have</span>
|
||
</span><span class="code-line"><span class="token comment">-- questions</span>
|
||
</span><span class="code-line"><span class="token comment">-- for</span>
|
||
</span><span class="code-line"><span class="token comment">-- you</span>
|
||
</span></code></pre>
|
||
<!--rehype:className=style-round wrap-text-->
|
||
</div></div></div></div></div><div class="wrap h2body-exist"><div class="wrap-header h2wrap"><h2 id="数学方法"><a aria-hidden="true" tabindex="-1" href="#数学方法"><span class="icon icon-link"></span></a>数学方法</h2><div class="wrap-body">
|
||
</div></div><div class="h2wrap-body"><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="常用方法"><a aria-hidden="true" tabindex="-1" href="#常用方法"><span class="icon icon-link"></span></a>常用方法</h3><div class="wrap-body">
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token comment">-- 一个比任何数字都大的浮点数</span>
|
||
</span><span class="code-line">math<span class="token punctuation">.</span>huge
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">-- 最小值的整数</span>
|
||
</span><span class="code-line">math<span class="token punctuation">.</span>mininteger
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token keyword">local</span> a <span class="token operator">=</span> math<span class="token punctuation">.</span><span class="token function">abs</span><span class="token punctuation">(</span><span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">)</span> <span class="token comment">-- 1</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">-- 返回不小于该数到最小整数</span>
|
||
</span><span class="code-line"><span class="token keyword">local</span> b <span class="token operator">=</span> math<span class="token punctuation">.</span><span class="token function">ceil</span><span class="token punctuation">(</span><span class="token number">1.2</span><span class="token punctuation">)</span> <span class="token comment">-- 2</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">-- 返回不大于该数到最大整数</span>
|
||
</span><span class="code-line"><span class="token keyword">local</span> c <span class="token operator">=</span> math<span class="token punctuation">.</span><span class="token function">floor</span><span class="token punctuation">(</span><span class="token number">1.2</span><span class="token punctuation">)</span> <span class="token comment">-- 1</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">-- 取余</span>
|
||
</span><span class="code-line"><span class="token keyword">local</span> d <span class="token operator">=</span> math<span class="token punctuation">.</span><span class="token function">fmod</span><span class="token punctuation">(</span><span class="token number">9.9</span><span class="token punctuation">,</span> <span class="token number">9</span><span class="token punctuation">)</span> <span class="token comment">-- 0.9</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">-- 返回最大值</span>
|
||
</span><span class="code-line"><span class="token keyword">local</span> g <span class="token operator">=</span> math<span class="token punctuation">.</span><span class="token function">max</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">)</span> <span class="token comment">-- 3</span>
|
||
</span><span class="code-line"><span class="token comment">-- 返回最小值</span>
|
||
</span><span class="code-line"><span class="token keyword">local</span> h <span class="token operator">=</span> math<span class="token punctuation">.</span><span class="token function">min</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">)</span> <span class="token comment">-- 1</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">-- 返回参数的平方根</span>
|
||
</span><span class="code-line"><span class="token keyword">local</span> r <span class="token operator">=</span> math<span class="token punctuation">.</span><span class="token function">sqrt</span><span class="token punctuation">(</span><span class="token number">3</span><span class="token punctuation">)</span> <span class="token comment">-- 9</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="工具方法"><a aria-hidden="true" tabindex="-1" href="#工具方法"><span class="icon icon-link"></span></a>工具方法</h3><div class="wrap-body">
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token comment">-- 返回数字的类型，</span>
|
||
</span><span class="code-line"><span class="token keyword">local</span> l <span class="token operator">=</span> math<span class="token punctuation">.</span><span class="token function">type</span><span class="token punctuation">(</span><span class="token number">1.2</span><span class="token punctuation">)</span> <span class="token comment">-- float</span>
|
||
</span><span class="code-line"><span class="token keyword">local</span> m <span class="token operator">=</span> math<span class="token punctuation">.</span><span class="token function">type</span><span class="token punctuation">(</span><span class="token number">3</span><span class="token punctuation">)</span> <span class="token comment">-- integer</span>
|
||
</span><span class="code-line"><span class="token keyword">local</span> n <span class="token operator">=</span> math<span class="token punctuation">.</span><span class="token function">type</span><span class="token punctuation">(</span><span class="token string">""</span><span class="token punctuation">)</span> <span class="token comment">-- nil</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">-- 返回以指定底底对数</span>
|
||
</span><span class="code-line"><span class="token keyword">local</span> e <span class="token operator">=</span> math<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token number">4</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">)</span> <span class="token comment">-- 2</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">-- 返回以 e 为底的自然对数</span>
|
||
</span><span class="code-line"><span class="token keyword">local</span> f <span class="token operator">=</span> math<span class="token punctuation">.</span><span class="token function">exp</span><span class="token punctuation">(</span><span class="token number">2</span><span class="token punctuation">)</span> <span class="token comment">-- 7.3890560989307</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">-- 返回 [0,1) 区间内一致分布的浮点伪随机数</span>
|
||
</span><span class="code-line">math<span class="token punctuation">.</span><span class="token function">random</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token comment">-- 返回 [1, n] 区间内一致分布的整数伪随机数</span>
|
||
</span><span class="code-line">math<span class="token punctuation">.</span><span class="token function">random</span><span class="token punctuation">(</span><span class="token number">10</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token comment">-- 返回 [n, m] 区间内一致分布的整数伪随机数</span>
|
||
</span><span class="code-line">math<span class="token punctuation">.</span><span class="token function">random</span><span class="token punctuation">(</span><span class="token number">10</span><span class="token punctuation">,</span> <span class="token number">100</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">-- 无符号整数比较，参数一 小于 参数二 则返回 true，否则返回 false</span>
|
||
</span><span class="code-line"><span class="token keyword">local</span> o <span class="token operator">=</span> math<span class="token punctuation">.</span><span class="token function">ult</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">10</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">-- 如果参数可以转换为一个整数，则返回该整数，否则返回 nil</span>
|
||
</span><span class="code-line"><span class="token keyword">local</span> p <span class="token operator">=</span> math<span class="token punctuation">.</span><span class="token function">tointeger</span><span class="token punctuation">(</span><span class="token string">"3"</span><span class="token punctuation">)</span> <span class="token comment">-- 3</span>
|
||
</span><span class="code-line"><span class="token keyword">local</span> q <span class="token operator">=</span> math<span class="token punctuation">.</span><span class="token function">tointeger</span><span class="token punctuation">(</span><span class="token number">0.32</span><span class="token punctuation">)</span> <span class="token comment">-- nil</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">-- 返回整数和小数部分</span>
|
||
</span><span class="code-line"><span class="token keyword">local</span> i<span class="token punctuation">,</span> j <span class="token operator">=</span> math<span class="token punctuation">.</span><span class="token function">modf</span><span class="token punctuation">(</span><span class="token number">3.14</span><span class="token punctuation">)</span> <span class="token comment">-- 3 0.14</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="其它方法"><a aria-hidden="true" tabindex="-1" href="#其它方法"><span class="icon icon-link"></span></a>其它方法</h3><div class="wrap-body">
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token comment">-- 圆周率</span>
|
||
</span><span class="code-line">math<span class="token punctuation">.</span>pi <span class="token comment">-- 3.1415926535898</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">-- 正弦方法（以下皆是以弧度表示）</span>
|
||
</span><span class="code-line">math<span class="token punctuation">.</span><span class="token function">sin</span><span class="token punctuation">(</span>math<span class="token punctuation">.</span>pi <span class="token operator">/</span> <span class="token number">2</span><span class="token punctuation">)</span> <span class="token comment">-- 1.0</span>
|
||
</span><span class="code-line"><span class="token comment">-- 余弦方法</span>
|
||
</span><span class="code-line">math<span class="token punctuation">.</span><span class="token function">cos</span><span class="token punctuation">(</span>math<span class="token punctuation">.</span>pi<span class="token punctuation">)</span> <span class="token comment">-- -1.0</span>
|
||
</span><span class="code-line"><span class="token comment">-- 正切方法</span>
|
||
</span><span class="code-line">math<span class="token punctuation">.</span><span class="token function">tan</span><span class="token punctuation">(</span>math<span class="token punctuation">.</span>pi <span class="token operator">/</span> <span class="token number">4</span><span class="token punctuation">)</span> <span class="token comment">-- 1.0</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">-- 反正弦方法（以下皆是以弧度表示）</span>
|
||
</span><span class="code-line">math<span class="token punctuation">.</span><span class="token function">acos</span><span class="token punctuation">(</span><span class="token number">1.0</span><span class="token punctuation">)</span> <span class="token comment">-- 0.0</span>
|
||
</span><span class="code-line"><span class="token comment">-- 反余弦方法</span>
|
||
</span><span class="code-line">math<span class="token punctuation">.</span><span class="token function">acos</span><span class="token punctuation">(</span><span class="token number">1.0</span><span class="token punctuation">)</span> <span class="token comment">-- 1.5707963267949</span>
|
||
</span><span class="code-line"><span class="token comment">-- 反正弦方法</span>
|
||
</span><span class="code-line">math<span class="token punctuation">.</span><span class="token function">atan</span><span class="token punctuation">(</span><span class="token number">1.0</span><span class="token punctuation">)</span> <span class="token comment">-- 0.78539816339745</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">-- 角度转换为弧度</span>
|
||
</span><span class="code-line">math<span class="token punctuation">.</span><span class="token function">rad</span><span class="token punctuation">(</span><span class="token number">90</span><span class="token punctuation">)</span> <span class="token comment">-- 1.5707963267949</span>
|
||
</span><span class="code-line"><span class="token comment">-- 弧度转换为角度</span>
|
||
</span><span class="code-line">math<span class="token punctuation">.</span><span class="token function">deg</span><span class="token punctuation">(</span>math<span class="token punctuation">.</span>pi<span class="token punctuation">)</span> <span class="token comment">-- 180.0</span>
|
||
</span></code></pre>
|
||
</div></div></div></div></div><div class="wrap h2body-exist"><div class="wrap-header h2wrap"><h2 id="table-1"><a aria-hidden="true" tabindex="-1" href="#table-1"><span class="icon icon-link"></span></a>table</h2><div class="wrap-body">
|
||
</div></div><div class="h2wrap-body"><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="初始化数组"><a aria-hidden="true" tabindex="-1" href="#初始化数组"><span class="icon icon-link"></span></a>初始化数组</h3><div class="wrap-body">
|
||
<p>初始化一个空数组</p>
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token keyword">local</span> array <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>
|
||
</span></code></pre>
|
||
<hr>
|
||
<p>默认的数组索引从 1 开始</p>
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token keyword">local</span> array <span class="token operator">=</span> <span class="token punctuation">{</span> <span class="token string">"a"</span><span class="token punctuation">,</span> <span class="token string">"b"</span><span class="token punctuation">,</span> <span class="token string">"c"</span><span class="token punctuation">,</span> <span class="token string">"d"</span> <span class="token punctuation">}</span>
|
||
</span><span class="code-line">array<span class="token punctuation">[</span><span class="token number">5</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token string">"e"</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token keyword">for</span> i <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">5</span> <span class="token keyword">do</span>
|
||
</span><span class="code-line"> <span class="token function">print</span><span class="token punctuation">(</span>array<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">end</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="多维数组"><a aria-hidden="true" tabindex="-1" href="#多维数组"><span class="icon icon-link"></span></a>多维数组</h3><div class="wrap-body">
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token keyword">local</span> array <span class="token operator">=</span> <span class="token punctuation">{</span>
|
||
</span><span class="code-line"> <span class="token punctuation">{</span> <span class="token string">"a"</span><span class="token punctuation">,</span> <span class="token string">"b"</span><span class="token punctuation">,</span> <span class="token string">"c"</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
|
||
</span><span class="code-line"> <span class="token punctuation">{</span> <span class="token string">"d"</span><span class="token punctuation">,</span> <span class="token string">"e"</span><span class="token punctuation">,</span> <span class="token string">"f"</span> <span class="token punctuation">}</span>
|
||
</span><span class="code-line"><span class="token punctuation">}</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token keyword">for</span> i <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token operator">#</span>array <span class="token keyword">do</span>
|
||
</span><span class="code-line"> <span class="token keyword">for</span> j <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token operator">#</span>array<span class="token punctuation">[</span>i<span class="token punctuation">]</span> <span class="token keyword">do</span>
|
||
</span><span class="code-line"> <span class="token function">print</span><span class="token punctuation">(</span>array<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">[</span>j<span class="token punctuation">]</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"> <span class="token keyword">end</span>
|
||
</span><span class="code-line"><span class="token keyword">end</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="初始化-table"><a aria-hidden="true" tabindex="-1" href="#初始化-table"><span class="icon icon-link"></span></a>初始化 table</h3><div class="wrap-body">
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token keyword">local</span> table <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line">table<span class="token punctuation">.</span>name <span class="token operator">=</span> <span class="token string">"fw"</span>
|
||
</span><span class="code-line">table<span class="token punctuation">.</span>age <span class="token operator">=</span> <span class="token string">"18"</span>
|
||
</span><span class="code-line">table<span class="token punctuation">[</span><span class="token string">"sex"</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token string">"boy"</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">-- 获取 table 的长度</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span><span class="token operator">#</span>table<span class="token punctuation">)</span> <span class="token comment">-- 3</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">-- 如果想要删除一个 table，那么可以使用 nil 赋值</span>
|
||
</span><span class="code-line">table <span class="token operator">=</span> <span class="token keyword">nil</span>
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>table<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-not-exist col-span-2"><div class="wrap-header h3wrap"><h3 id="table-方法"><a aria-hidden="true" tabindex="-1" href="#table-方法"><span class="icon icon-link"></span></a>table 方法</h3><div class="wrap-body">
|
||
<!--rehype:wrap-class=col-span-2-->
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token comment">-- 用于连接 table 中指定的元素</span>
|
||
</span><span class="code-line"><span class="token comment">-- table.concat(table [, sep [, start [, end]]])</span>
|
||
</span><span class="code-line"><span class="token keyword">local</span> a <span class="token operator">=</span> <span class="token punctuation">{</span> <span class="token string">"apple"</span><span class="token punctuation">,</span> <span class="token string">"orange"</span><span class="token punctuation">,</span> <span class="token string">"peach"</span> <span class="token punctuation">}</span>
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>table<span class="token punctuation">.</span><span class="token function">concat</span><span class="token punctuation">(</span>a<span class="token punctuation">,</span> <span class="token string">"->"</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token comment">-- orange->peach</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">-- 用于向指定闻之插入元素。默认数组末尾</span>
|
||
</span><span class="code-line"><span class="token comment">-- table.insert(table, [pos,] value)</span>
|
||
</span><span class="code-line"><span class="token keyword">local</span> a <span class="token operator">=</span> <span class="token punctuation">{</span> <span class="token string">"apple"</span><span class="token punctuation">,</span> <span class="token string">"orange"</span><span class="token punctuation">,</span> <span class="token string">"peach"</span> <span class="token punctuation">}</span>
|
||
</span><span class="code-line">table<span class="token punctuation">.</span><span class="token function">insert</span><span class="token punctuation">(</span>a<span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token string">"pear"</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>a<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token comment">-- pear</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">-- table.move(a1,f,e,t[,a2])</span>
|
||
</span><span class="code-line"><span class="token comment">-- 表a1，a1下标开始位置f，a1下标结束位置e，t选择移动到的开始位置(如果没有a2，默认a1的下标)</span>
|
||
</span><span class="code-line"><span class="token keyword">local</span> array <span class="token operator">=</span> <span class="token punctuation">{</span> <span class="token string">"a"</span><span class="token punctuation">,</span> <span class="token string">"b"</span><span class="token punctuation">,</span> <span class="token string">"c"</span> <span class="token punctuation">}</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token keyword">for</span> i<span class="token punctuation">,</span>v <span class="token keyword">in</span> <span class="token function">pairs</span><span class="token punctuation">(</span>table<span class="token punctuation">.</span><span class="token function">move</span><span class="token punctuation">(</span>array<span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token keyword">do</span>
|
||
</span><span class="code-line"> <span class="token function">print</span><span class="token punctuation">(</span>v<span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">end</span> <span class="token comment">-- a a b c</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token comment">-- table.sort (table [, comp])</span>
|
||
</span><span class="code-line"><span class="token comment">-- 排序，默认是升序</span>
|
||
</span><span class="code-line"><span class="token keyword">local</span> array <span class="token operator">=</span> <span class="token punctuation">{</span> <span class="token string">"a"</span><span class="token punctuation">,</span> <span class="token string">"c"</span><span class="token punctuation">,</span> <span class="token string">"b"</span> <span class="token punctuation">}</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token keyword">local</span> f <span class="token operator">=</span> <span class="token keyword">function</span><span class="token punctuation">(</span>a<span class="token punctuation">,</span> b<span class="token punctuation">)</span>
|
||
</span><span class="code-line"> <span class="token keyword">return</span> string<span class="token punctuation">.</span><span class="token function">byte</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span> <span class="token operator">-</span> string<span class="token punctuation">.</span><span class="token function">byte</span><span class="token punctuation">(</span>b<span class="token punctuation">)</span> <span class="token operator">></span> <span class="token number">0</span>
|
||
</span><span class="code-line"><span class="token keyword">end</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line">table<span class="token punctuation">.</span><span class="token function">sort</span><span class="token punctuation">(</span>array<span class="token punctuation">,</span> f<span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">for</span> i<span class="token punctuation">,</span> v <span class="token keyword">in</span> <span class="token function">pairs</span><span class="token punctuation">(</span>array<span class="token punctuation">)</span> <span class="token keyword">do</span>
|
||
</span><span class="code-line"> <span class="token function">print</span><span class="token punctuation">(</span>v<span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">end</span> <span class="token comment">-- c b a</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-exist"><div class="wrap-header h3wrap"><h3 id="迭代器"><a aria-hidden="true" tabindex="-1" href="#迭代器"><span class="icon icon-link"></span></a>迭代器</h3><div class="wrap-body">
|
||
<h4 id="无状态的迭代器"><a aria-hidden="true" tabindex="-1" href="#无状态的迭代器"><span class="icon icon-link"></span></a>无状态的迭代器</h4>
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token keyword">function</span> <span class="token function">square</span><span class="token punctuation">(</span>d<span class="token punctuation">,</span>n<span class="token punctuation">)</span>
|
||
</span><span class="code-line"> <span class="token keyword">if</span> n <span class="token operator"><</span> d
|
||
</span><span class="code-line"> <span class="token keyword">then</span>
|
||
</span><span class="code-line"> n <span class="token operator">=</span> n <span class="token operator">+</span> <span class="token number">1</span>
|
||
</span><span class="code-line"> <span class="token keyword">return</span> n<span class="token punctuation">,</span> n<span class="token operator">*</span>n
|
||
</span><span class="code-line"> <span class="token keyword">end</span>
|
||
</span><span class="code-line"><span class="token keyword">end</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token keyword">for</span> i<span class="token punctuation">,</span>n <span class="token keyword">in</span> square<span class="token punctuation">,</span><span class="token number">5</span><span class="token punctuation">,</span><span class="token number">0</span>
|
||
</span><span class="code-line"><span class="token keyword">do</span>
|
||
</span><span class="code-line"> <span class="token function">print</span><span class="token punctuation">(</span>i<span class="token punctuation">,</span>n<span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">end</span>
|
||
</span></code></pre>
|
||
<h4 id="for-循环迭代器"><a aria-hidden="true" tabindex="-1" href="#for-循环迭代器"><span class="icon icon-link"></span></a>for 循环迭代器</h4>
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token keyword">for</span> i<span class="token punctuation">,</span> n <span class="token keyword">in</span> <span class="token function">pairs</span><span class="token punctuation">(</span><span class="token punctuation">{</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">4</span> <span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token keyword">do</span>
|
||
</span><span class="code-line"> <span class="token function">print</span><span class="token punctuation">(</span>i<span class="token punctuation">,</span> n<span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">end</span>
|
||
</span></code></pre>
|
||
</div></div></div></div></div><div class="wrap h2body-exist"><div class="wrap-header h2wrap"><h2 id="模块"><a aria-hidden="true" tabindex="-1" href="#模块"><span class="icon icon-link"></span></a>模块</h2><div class="wrap-body">
|
||
</div></div><div class="h2wrap-body"><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="定义模块"><a aria-hidden="true" tabindex="-1" href="#定义模块"><span class="icon icon-link"></span></a>定义模块</h3><div class="wrap-body">
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token comment">-- a.lua</span>
|
||
</span><span class="code-line"><span class="token keyword">local</span> mod <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line">mod<span class="token punctuation">.</span>cool <span class="token operator">=</span> <span class="token string">"this is a mod"</span>
|
||
</span><span class="code-line"><span class="token keyword">function</span> mod<span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"> <span class="token function">print</span><span class="token punctuation">(</span><span class="token string">"this is a function"</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">end</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token keyword">return</span> mod
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="导入模块"><a aria-hidden="true" tabindex="-1" href="#导入模块"><span class="icon icon-link"></span></a>导入模块</h3><div class="wrap-body">
|
||
<p>一般我们可以直接使用 <code>require</code> 导入</p>
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token comment">-- b.lua</span>
|
||
</span><span class="code-line"><span class="token comment">-- local mod = require("a")</span>
|
||
</span><span class="code-line"><span class="token comment">-- 使用 pcall 确保 require 函数导入成功，失败则返回一个 false 状态</span>
|
||
</span><span class="code-line"><span class="token keyword">local</span> status<span class="token punctuation">,</span> mod <span class="token operator">=</span> <span class="token function">pcall</span><span class="token punctuation">(</span>require<span class="token punctuation">,</span> <span class="token string">"a"</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token keyword">if</span> <span class="token keyword">not</span> status <span class="token keyword">then</span>
|
||
</span><span class="code-line"> <span class="token keyword">return</span>
|
||
</span><span class="code-line"><span class="token keyword">end</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line">mod<span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token function">print</span><span class="token punctuation">(</span>mod<span class="token punctuation">.</span>cool<span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="私有函数"><a aria-hidden="true" tabindex="-1" href="#私有函数"><span class="icon icon-link"></span></a>私有函数</h3><div class="wrap-body">
|
||
<pre class="language-lua"><code class="language-lua code-highlight"><span class="code-line"><span class="token keyword">local</span> mod <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token keyword">local</span> <span class="token keyword">function</span> <span class="token function">private</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"> <span class="token function">print</span><span class="token punctuation">(</span><span class="token string">"private"</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">end</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token keyword">function</span> mod<span class="token punctuation">.</span><span class="token function">public</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"> <span class="token function">private</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line"><span class="token keyword">end</span>
|
||
</span><span class="code-line">
|
||
</span><span class="code-line"><span class="token keyword">return</span> mod
|
||
</span></code></pre>
|
||
</div></div></div></div></div><div class="wrap h2body-not-exist"><div class="wrap-header h2wrap"><h2 id="另见"><a aria-hidden="true" tabindex="-1" href="#另见"><span class="icon icon-link"></span></a>另见</h2><div class="wrap-body">
|
||
<ul>
|
||
<li><a href="http://www.lua.org">Lua 官网</a> <em>(lua.org)</em></li>
|
||
<li><a href="https://wiki.luatos.com/luaGuide/introduction.html">luatos</a> <em>(wiki.luatos.com)</em></li>
|
||
<li><a href="https://www.twle.cn/l/yufei/lua53/lua-basic-index.html">Lua 教程</a> <em>(twle.cn)</em></li>
|
||
</ul>
|
||
</div></div><div class="h2wrap-body"></div></div></div></div><footer class="footer-wrap"><footer class="max-container">© 2022 Kenny Wang.</footer></footer><script src="../data.js" defer></script><script src="../js/fuse.min.js" defer></script><script src="../js/main.js" defer></script><div id="mysearch"><div class="mysearch-box"><div class="mysearch-input"><div><svg xmlns="http://www.w3.org/2000/svg" height="1em" width="1em" viewBox="0 0 18 18">
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