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HTML
591 lines
42 KiB
HTML
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<html lang="en" data-color-mode="dark">
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<head>
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<meta charset="utf-8">
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<title>XPath 备忘清单
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& xpath cheatsheet & Quick Reference</title>
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<meta description="这是一份 XPath 选择器备忘单，其中列出了常用的 `XPath` 定位方法和 `CSS` 选择器为开发人员分享快速参考备忘单。">
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<meta keywords="Quick,Reference,cheatsheet,xpath">
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</svg>
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<span class="title">Quick Reference</span></a><div class="menu"><a href="https://github.com/jaywcjlove/reference/blob/main/docs/xpath.md" class="" target="__blank"><svg viewBox="0 0 36 36" fill="currentColor" height="1em" width="1em"><path d="m33 6.4-3.7-3.7a1.71 1.71 0 0 0-2.36 0L23.65 6H6a2 2 0 0 0-2 2v22a2 2 0 0 0 2 2h22a2 2 0 0 0 2-2V11.76l3-3a1.67 1.67 0 0 0 0-2.36ZM18.83 20.13l-4.19.93 1-4.15 9.55-9.57 3.23 3.23ZM29.5 9.43 26.27 6.2l1.85-1.85 3.23 3.23Z"></path><path fill="none" d="M0 0h36v36H0z"></path></svg><span>编辑</span></a><button id="darkMode" type="button"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor" class="light" height="1em" width="1em">
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</script><a href="https://github.com/jaywcjlove/reference" class="" target="__blank"><svg viewBox="0 0 16 16" fill="currentColor" height="1em" width="1em"><path d="M8 0C3.58 0 0 3.58 0 8c0 3.54 2.29 6.53 5.47 7.59.4.07.55-.17.55-.38 0-.19-.01-.82-.01-1.49-2.01.37-2.53-.49-2.69-.94-.09-.23-.48-.94-.82-1.13-.28-.15-.68-.52-.01-.53.63-.01 1.08.58 1.23.82.72 1.21 1.87.87 2.33.66.07-.52.28-.87.51-1.07-1.78-.2-3.64-.89-3.64-3.95 0-.87.31-1.59.82-2.15-.08-.2-.36-1.02.08-2.12 0 0 .67-.21 2.2.82.64-.18 1.32-.27 2-.27.68 0 1.36.09 2 .27 1.53-1.04 2.2-.82 2.2-.82.44 1.1.16 1.92.08 2.12.51.56.82 1.27.82 2.15 0 3.07-1.87 3.75-3.65 3.95.29.25.54.73.54 1.48 0 1.07-.01 1.93-.01 2.2 0 .21.15.46.55.38A8.012 8.012 0 0 0 16 8c0-4.42-3.58-8-8-8z"></path></svg></a></div></div></nav><div class="wrap max-container"><header class="wrap-header h1wrap"><h1 id="xpath-备忘清单"><a aria-hidden="true" tabindex="-1" href="#xpath-备忘清单"><span class="icon icon-link"></span></a>XPath 备忘清单</h1><div class="wrap-body">
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<p>这是一份 XPath 选择器备忘单，其中列出了常用的 <code>XPath</code> 定位方法和 <code>CSS</code> 选择器</p>
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</div></header><div class="h1wrap-body"><div class="wrap"><div class="wrap-header h2wrap"><h2 id="xpath-选择器"><a aria-hidden="true" tabindex="-1" href="#xpath-选择器"><span class="icon icon-link"></span></a>XPath 选择器</h2><div class="wrap-body">
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</div></div><div class="h2wrap-body"><div class="wrap"><div class="wrap-header h3wrap"><h3 id="入门"><a aria-hidden="true" tabindex="-1" href="#入门"><span class="icon icon-link"></span></a>入门</h3><div class="wrap-body">
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<p>XPath 即为 XML 路径语言（XML Path Language），它是一种用来确定XML文档中某部分位置的计算机语言。</p>
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<ul>
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<li><a href="http://www.whitebeam.org/library/guide/TechNotes/xpathtestbed.rhtm">Xpath test bed</a> <em>(whitebeam.org)</em></li>
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</ul>
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<p>在 Firefox 或 Chrome 控制台中测试：</p>
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<pre class="language-js"><code class="language-js code-highlight"><span class="code-line line-number" line="1"><span class="token function">$x</span><span class="token punctuation">(</span><span class="token string">'/html/body'</span><span class="token punctuation">)</span>
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</span><span class="code-line line-number" line="2"><span class="token function">$x</span><span class="token punctuation">(</span><span class="token string">'//h1'</span><span class="token punctuation">)</span>
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</span><span class="code-line line-number" line="3"><span class="token function">$x</span><span class="token punctuation">(</span><span class="token string">'//h1'</span><span class="token punctuation">)</span><span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token property-access">innerText</span>
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</span><span class="code-line line-number" line="4"><span class="token function">$x</span><span class="token punctuation">(</span><span class="token string">'//a[text()="XPath"]'</span><span class="token punctuation">)</span><span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token method function property-access">click</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
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</span></code></pre>
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</div></div></div><div class="wrap"><div class="wrap-header h3wrap"><h3 id="后代选择器"><a aria-hidden="true" tabindex="-1" href="#后代选择器"><span class="icon icon-link"></span></a>后代选择器</h3><div class="wrap-body">
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<table class="show-header">
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<thead>
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<tr>
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<th>Xpath</th>
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<th>CSS</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><code>//h1</code></td>
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<td>h1</td>
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</tr>
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<tr>
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<td><code>//div//p</code></td>
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<td>div p</td>
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</tr>
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<tr>
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<td><code>//ul/li</code></td>
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<td>ul > li</td>
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</tr>
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<tr>
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<td><code>//ul/li/a</code></td>
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<td>ul > li > a</td>
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</tr>
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<tr>
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<td><code>//div/*</code></td>
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<td>div > *</td>
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</tr>
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<tr>
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<td><code>/</code></td>
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<td>:root</td>
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</tr>
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<tr>
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<td><code>/html/body</code></td>
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<td>:root > body</td>
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</tr>
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</tbody>
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</table><!--rehype:className=show-header-->
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</div></div></div><div class="wrap"><div class="wrap-header h3wrap"><h3 id="有序选择器"><a aria-hidden="true" tabindex="-1" href="#有序选择器"><span class="icon icon-link"></span></a>有序选择器</h3><div class="wrap-body">
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<table class="show-header">
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<thead>
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<tr>
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<th>Xpath</th>
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<th>CSS</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><code>//ul/li[1]</code></td>
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<td>ul > li:first-child</td>
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</tr>
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<tr>
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<td><code>//ul/li[2]</code></td>
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<td>ul > li:nth-child(2)</td>
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</tr>
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<tr>
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<td><code>//ul/li[last()]</code></td>
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<td>ul > li:last-child</td>
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</tr>
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<tr>
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<td><code>//li[@id="id"][1]</code></td>
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<td>li#id:first-child</td>
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</tr>
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<tr>
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<td><code>//a[1]</code></td>
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<td>a:first-child</td>
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</tr>
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<tr>
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<td><code>//a[last()]</code></td>
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<td>a:last-child</td>
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</tr>
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</tbody>
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</table><!--rehype:className=show-header-->
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</div></div></div><div class="wrap col-span-2 row-span-2"><div class="wrap-header h3wrap"><h3 id="属性选择器"><a aria-hidden="true" tabindex="-1" href="#属性选择器"><span class="icon icon-link"></span></a>属性选择器</h3><div class="wrap-body"><!--rehype:wrap-class=col-span-2 row-span-2-->
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<table class="show-header">
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<thead>
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<tr>
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<th>Xpath</th>
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<th>CSS</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><code>//*[@id="id"]</code></td>
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<td>#id</td>
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</tr>
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<tr>
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<td><code>//*[@class="class"]</code></td>
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<td>.class</td>
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</tr>
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<tr>
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<td><code>//input[@type="submit"]</code></td>
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<td>input[type="submit"]</td>
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</tr>
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<tr>
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<td><code>//a[@id="abc"][@for="xyz"]</code></td>
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<td>a#abc[for="xyz"]</td>
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</tr>
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<tr>
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<td><code>//a[@rel]</code></td>
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<td>a[rel]</td>
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</tr>
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<tr>
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<td><code>//a[starts-with(@href, '/')]</code></td>
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<td>a[href^='/']</td>
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</tr>
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<tr>
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<td><code>//a[ends-with(@href, '.pdf')]</code></td>
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<td>a[href$='pdf']</td>
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</tr>
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<tr>
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<td><code>//a[contains(@href, '://')]</code></td>
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<td>a[href*='<code>:</code>//']</td>
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</tr>
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<tr>
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<td><code>//a[contains(@rel, 'help')]</code></td>
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<td>a[rel~='help']</td>
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</tr>
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</tbody>
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</table><!--rehype:className=show-header-->
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</div></div></div><div class="wrap"><div class="wrap-header h3wrap"><h3 id="兄弟姐妹选择器"><a aria-hidden="true" tabindex="-1" href="#兄弟姐妹选择器"><span class="icon icon-link"></span></a>兄弟姐妹选择器</h3><div class="wrap-body">
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<table class="show-header">
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<thead>
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<tr>
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<th>Xpath</th>
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<th>CSS</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><code>//h1/following-sibling::ul</code></td>
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<td>h1 ~ ul</td>
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</tr>
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<tr>
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<td><code>//h1/following-sibling::ul[1]</code></td>
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<td>h1 + ul</td>
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</tr>
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<tr>
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<td><code>//h1/following-sibling::[@id="id"]</code></td>
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<td>h1 ~ #id</td>
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</tr>
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</tbody>
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</table><!--rehype:className=show-header-->
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</div></div></div><div class="wrap"><div class="wrap-header h3wrap"><h3 id="jquery"><a aria-hidden="true" tabindex="-1" href="#jquery"><span class="icon icon-link"></span></a>jQuery</h3><div class="wrap-body">
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<table class="show-header">
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<thead>
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<tr>
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<th>Xpath</th>
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<th>CSS</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><code>//ul/li/..</code></td>
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<td>$('ul > li').parent()</td>
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</tr>
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<tr>
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<td><code>//li/ancestor-or-self::section</code></td>
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<td>$('li').closest('section')</td>
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</tr>
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<tr>
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<td><code>//a/@href</code></td>
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<td>$('a').attr('href')</td>
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</tr>
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<tr>
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<td><code>//span/text()</code></td>
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<td>$('span').text()</td>
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</tr>
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</tbody>
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</table><!--rehype:className=show-header-->
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</div></div></div><div class="wrap"><div class="wrap-header h3wrap"><h3 id="杂项选择器"><a aria-hidden="true" tabindex="-1" href="#杂项选择器"><span class="icon icon-link"></span></a>杂项选择器</h3><div class="wrap-body">
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<table class="show-header">
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<thead>
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<tr>
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<th>Xpath</th>
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<th>CSS</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><code>//h1[not(@id)]</code></td>
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<td>h1:not([id])</td>
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</tr>
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<tr>
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<td><code>//button[text()="Submit"]</code></td>
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<td>文字匹配</td>
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</tr>
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<tr>
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<td><code>//button[contains(text(),"Go")]</code></td>
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<td>文本包含（子字符串）</td>
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</tr>
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<tr>
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<td><code>//product[@price > 2.50]</code></td>
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<td>算术</td>
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</tr>
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<tr>
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<td><code>//ul[*]</code></td>
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<td>有孩子</td>
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</tr>
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<tr>
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<td><code>//ul[li]</code></td>
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<td>有孩子（具体）</td>
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</tr>
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<tr>
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<td><code>//a[@name or @href]</code></td>
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<td>或逻辑</td>
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</tr>
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<tr>
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<td>`//a</td>
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<td>//div`</td>
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</tr>
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</tbody>
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</table><!--rehype:className=show-header-->
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</div></div></div></div></div><div class="wrap"><div class="wrap-header h2wrap"><h2 id="xpath-表达式"><a aria-hidden="true" tabindex="-1" href="#xpath-表达式"><span class="icon icon-link"></span></a>XPath 表达式</h2><div class="wrap-body">
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</div></div><div class="h2wrap-body"><div class="wrap"><div class="wrap-header h3wrap"><h3 id="步骤和轴"><a aria-hidden="true" tabindex="-1" href="#步骤和轴"><span class="icon icon-link"></span></a>步骤和轴</h3><div class="wrap-body">
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<table>
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<thead>
|
||
<tr>
|
||
<th>-</th>
|
||
<th>-</th>
|
||
<th>-</th>
|
||
<th>-</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr>
|
||
<td><code>//</code></td>
|
||
<td><code>ul</code></td>
|
||
<td><code>/</code></td>
|
||
<td><code>a[@id='link']</code></td>
|
||
</tr>
|
||
<tr>
|
||
<td>Axis</td>
|
||
<td>Step</td>
|
||
<td>Axis</td>
|
||
<td>Step</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
</div></div></div><div class="wrap"><div class="wrap-header h3wrap"><h3 id="前缀"><a aria-hidden="true" tabindex="-1" href="#前缀"><span class="icon icon-link"></span></a>前缀</h3><div class="wrap-body">
|
||
<table class="show-header">
|
||
<thead>
|
||
<tr>
|
||
<th>前缀</th>
|
||
<th>例子</th>
|
||
<th>意思是</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr>
|
||
<td><code>//</code></td>
|
||
<td><code>//hr[@class='edge']</code></td>
|
||
<td>任何地方</td>
|
||
</tr>
|
||
<tr>
|
||
<td><code>/</code></td>
|
||
<td><code>/html/body/div</code></td>
|
||
<td>根</td>
|
||
</tr>
|
||
<tr>
|
||
<td><code>./</code></td>
|
||
<td><code>./div/p</code></td>
|
||
<td>相对的</td>
|
||
</tr>
|
||
</tbody>
|
||
</table><!--rehype:className=show-header-->
|
||
</div></div></div><div class="wrap"><div class="wrap-header h3wrap"><h3 id="axes"><a aria-hidden="true" tabindex="-1" href="#axes"><span class="icon icon-link"></span></a>Axes</h3><div class="wrap-body">
|
||
<table class="show-header">
|
||
<thead>
|
||
<tr>
|
||
<th>Axis(轴)</th>
|
||
<th>例子</th>
|
||
<th>意思是</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr>
|
||
<td><code>/</code></td>
|
||
<td><code>//ul/li/a</code></td>
|
||
<td>孩子</td>
|
||
</tr>
|
||
<tr>
|
||
<td><code>//</code></td>
|
||
<td><code>//[@id="list"]//a</code></td>
|
||
<td>后裔</td>
|
||
</tr>
|
||
</tbody>
|
||
</table><!--rehype:className=show-header-->
|
||
</div></div></div></div></div><div class="wrap"><div class="wrap-header h2wrap"><h2 id="xpath-predicates谓词"><a aria-hidden="true" tabindex="-1" href="#xpath-predicates谓词"><span class="icon icon-link"></span></a>XPath Predicates(谓词)</h2><div class="wrap-body">
|
||
</div></div><div class="h2wrap-body"><div class="wrap"><div class="wrap-header h3wrap"><h3 id="predicates谓词"><a aria-hidden="true" tabindex="-1" href="#predicates谓词"><span class="icon icon-link"></span></a>Predicates(谓词)</h3><div class="wrap-body">
|
||
<pre class="language-bash"><code class="language-bash code-highlight"><span class="code-line line-number" line="1">//div<span class="token punctuation">[</span>true<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">]</span>
|
||
</span><span class="code-line line-number" line="2">//div<span class="token punctuation">[</span>@class<span class="token operator">=</span><span class="token string">"head"</span><span class="token punctuation">]</span>
|
||
</span><span class="code-line line-number" line="3">//div<span class="token punctuation">[</span>@class<span class="token operator">=</span><span class="token string">"head"</span><span class="token punctuation">]</span><span class="token punctuation">[</span>@id<span class="token operator">=</span><span class="token string">"top"</span><span class="token punctuation">]</span>
|
||
</span></code></pre>
|
||
<p>仅当某些条件为真时才限制节点集。它们可以被链接起来。</p>
|
||
</div></div></div><div class="wrap"><div class="wrap-header h3wrap"><h3 id="操作符"><a aria-hidden="true" tabindex="-1" href="#操作符"><span class="icon icon-link"></span></a>操作符</h3><div class="wrap-body">
|
||
<pre class="language-bash"><code class="language-bash code-highlight"><span class="code-line line-number" line="1"><span class="token comment"># 比较</span>
|
||
</span><span class="code-line line-number" line="2">//a<span class="token punctuation">[</span>@id <span class="token operator">=</span> <span class="token string">"xyz"</span><span class="token punctuation">]</span>
|
||
</span><span class="code-line line-number" line="3">//a<span class="token punctuation">[</span>@id <span class="token operator">!=</span> <span class="token string">"xyz"</span><span class="token punctuation">]</span>
|
||
</span><span class="code-line line-number" line="4">//a<span class="token punctuation">[</span>@price <span class="token operator">></span> <span class="token number">25</span><span class="token punctuation">]</span>
|
||
</span></code></pre>
|
||
<pre class="language-bash"><code class="language-bash code-highlight"><span class="code-line line-number" line="1"><span class="token comment"># 逻辑 (and/or)</span>
|
||
</span><span class="code-line line-number" line="2">//div<span class="token punctuation">[</span>@id<span class="token operator">=</span><span class="token string">"head"</span> and position<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">=</span><span class="token number">2</span><span class="token punctuation">]</span>
|
||
</span><span class="code-line line-number" line="3">//div<span class="token punctuation">[</span><span class="token punctuation">(</span>x and y<span class="token punctuation">)</span> or not<span class="token punctuation">(</span>z<span class="token punctuation">)</span><span class="token punctuation">]</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap"><div class="wrap-header h3wrap"><h3 id="使用节点"><a aria-hidden="true" tabindex="-1" href="#使用节点"><span class="icon icon-link"></span></a>使用节点</h3><div class="wrap-body">
|
||
<pre class="language-bash"><code class="language-bash code-highlight"><span class="code-line line-number" line="1"><span class="token comment"># 在函数内部使用它们</span>
|
||
</span><span class="code-line line-number" line="2">//ul<span class="token punctuation">[</span>count<span class="token punctuation">(</span>li<span class="token punctuation">)</span> <span class="token operator">></span> <span class="token number">2</span><span class="token punctuation">]</span>
|
||
</span><span class="code-line line-number" line="3">//ul<span class="token punctuation">[</span>count<span class="token punctuation">(</span>li<span class="token punctuation">[</span>@class<span class="token operator">=</span><span class="token string">'hide'</span><span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token operator">></span> <span class="token number">0</span><span class="token punctuation">]</span>
|
||
</span></code></pre>
|
||
<pre class="language-bash"><code class="language-bash code-highlight"><span class="code-line line-number" line="1"><span class="token comment"># 返回具有 `<li>` 子级的 `<ul>`</span>
|
||
</span><span class="code-line line-number" line="2">//ul<span class="token punctuation">[</span>li<span class="token punctuation">]</span>
|
||
</span></code></pre>
|
||
<p>您可以在谓词中使用节点。</p>
|
||
</div></div></div><div class="wrap"><div class="wrap-header h3wrap"><h3 id="索引"><a aria-hidden="true" tabindex="-1" href="#索引"><span class="icon icon-link"></span></a>索引</h3><div class="wrap-body">
|
||
<pre class="language-bash"><code class="language-bash code-highlight"><span class="code-line line-number" line="1">//a<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span> <span class="token comment"># 第一个<a></span>
|
||
</span><span class="code-line line-number" line="2">//a<span class="token punctuation">[</span>last<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">]</span> <span class="token comment"># 最后一个<a></span>
|
||
</span><span class="code-line line-number" line="3">//ol/li<span class="token punctuation">[</span><span class="token number">2</span><span class="token punctuation">]</span> <span class="token comment"># 第二个<li></span>
|
||
</span><span class="code-line line-number" line="4">//ol/li<span class="token punctuation">[</span>position<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">=</span><span class="token number">2</span><span class="token punctuation">]</span> <span class="token comment"># 和上面一样</span>
|
||
</span><span class="code-line line-number" line="5">//ol/li<span class="token punctuation">[</span>position<span class="token punctuation">(</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">#:not(:first-child)</span>
|
||
</span></code></pre>
|
||
<p>将 <code>[]</code> 与数字一起使用，或者使用 <code>last()</code> 或 <code>position()</code>。</p>
|
||
</div></div></div><div class="wrap"><div class="wrap-header h3wrap"><h3 id="链接顺序"><a aria-hidden="true" tabindex="-1" href="#链接顺序"><span class="icon icon-link"></span></a>链接顺序</h3><div class="wrap-body">
|
||
<pre class="language-bash"><code class="language-bash code-highlight"><span class="code-line line-number" line="1">a<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">[</span>@href<span class="token operator">=</span><span class="token string">'/'</span><span class="token punctuation">]</span>
|
||
</span><span class="code-line line-number" line="2">a<span class="token punctuation">[</span>@href<span class="token operator">=</span><span class="token string">'/'</span><span class="token punctuation">]</span><span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span>
|
||
</span></code></pre>
|
||
<p>顺序很重要，这两个是不同的。</p>
|
||
</div></div></div><div class="wrap"><div class="wrap-header h3wrap"><h3 id="嵌套谓词"><a aria-hidden="true" tabindex="-1" href="#嵌套谓词"><span class="icon icon-link"></span></a>嵌套谓词</h3><div class="wrap-body">
|
||
<pre><code class="code-highlight"><span class="code-line line-number" line="1">//section[.//h1[@id='hi']]
|
||
</span></code></pre>
|
||
<p>如果它有一个具有 <code>id='hi'</code> 的 <code><h1></code> 后代，则返回 <code><section></code>。</p>
|
||
</div></div></div></div></div><div class="wrap"><div class="wrap-header h2wrap"><h2 id="xpath-函数"><a aria-hidden="true" tabindex="-1" href="#xpath-函数"><span class="icon icon-link"></span></a>XPath 函数</h2><div class="wrap-body"><!--rehype:body-class=cols-2-->
|
||
</div></div><div class="h2wrap-body cols-2"><div class="wrap"><div class="wrap-header h3wrap"><h3 id="节点功能"><a aria-hidden="true" tabindex="-1" href="#节点功能"><span class="icon icon-link"></span></a>节点功能</h3><div class="wrap-body">
|
||
<pre class="language-bash"><code class="language-bash code-highlight"><span class="code-line line-number" line="1">name<span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token comment"># //[starts-with(name(), 'h')]</span>
|
||
</span><span class="code-line line-number" line="2">text<span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token comment"># //button[text()="Submit"]</span>
|
||
</span><span class="code-line line-number" line="3"> <span class="token comment"># //button/text()</span>
|
||
</span><span class="code-line line-number" line="4">lang<span class="token punctuation">(</span>str<span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="5">namespace-uri<span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
<pre class="language-bash"><code class="language-bash code-highlight"><span class="code-line line-number" line="1">count<span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token comment"># //table[count(tr)=1]</span>
|
||
</span><span class="code-line line-number" line="2">position<span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token comment"># //ol/li[position()=2]</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap"><div class="wrap-header h3wrap"><h3 id="字符串函数"><a aria-hidden="true" tabindex="-1" href="#字符串函数"><span class="icon icon-link"></span></a>字符串函数</h3><div class="wrap-body">
|
||
<pre class="language-bash"><code class="language-bash code-highlight"><span class="code-line line-number" line="1">contains<span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token comment"># font[contains(@class,"head")]</span>
|
||
</span><span class="code-line line-number" line="2">starts-with<span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token comment"># font[starts-with(@class,"head")]</span>
|
||
</span><span class="code-line line-number" line="3">ends-with<span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token comment"># font[ends-with(@class,"head")]</span>
|
||
</span></code></pre>
|
||
<pre class="language-bash"><code class="language-bash code-highlight"><span class="code-line line-number" line="1">concat<span class="token punctuation">(</span>x,y<span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="2">substring<span class="token punctuation">(</span>str, start, len<span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="3">substring-before<span class="token punctuation">(</span><span class="token string">"01/02"</span>, <span class="token string">"/"</span><span class="token punctuation">)</span> <span class="token comment">#=> 01</span>
|
||
</span><span class="code-line line-number" line="4">substring-after<span class="token punctuation">(</span><span class="token string">"01/02"</span>, <span class="token string">"/"</span><span class="token punctuation">)</span> <span class="token comment">#=> 02</span>
|
||
</span><span class="code-line line-number" line="5">translate<span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="6">normalize-space<span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="7">string-length<span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap"><div class="wrap-header h3wrap"><h3 id="布尔函数"><a aria-hidden="true" tabindex="-1" href="#布尔函数"><span class="icon icon-link"></span></a>布尔函数</h3><div class="wrap-body">
|
||
<pre class="language-bash"><code class="language-bash code-highlight"><span class="code-line line-number" line="1">not<span class="token punctuation">(</span>expr<span class="token punctuation">)</span> <span class="token comment"># button[not(starts-with(text(),"Submit"))]</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap"><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">
|
||
<pre class="language-bash"><code class="language-bash code-highlight"><span class="code-line line-number" line="1">string<span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="2">number<span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="3">boolean<span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||
</span></code></pre>
|
||
</div></div></div></div></div><div class="wrap"><div class="wrap-header h2wrap"><h2 id="xpath-axes"><a aria-hidden="true" tabindex="-1" href="#xpath-axes"><span class="icon icon-link"></span></a>XPath Axes</h2><div class="wrap-body"><!--rehype:body-class=cols-2-->
|
||
</div></div><div class="h2wrap-body cols-2"><div class="wrap"><div class="wrap-header h3wrap"><h3 id="使用轴"><a aria-hidden="true" tabindex="-1" href="#使用轴"><span class="icon icon-link"></span></a>使用轴</h3><div class="wrap-body">
|
||
<pre class="language-bash"><code class="language-bash code-highlight"><span class="code-line line-number" line="1">//ul/li <span class="token comment"># ul > li</span>
|
||
</span><span class="code-line line-number" line="2">//ul/child::li <span class="token comment"># ul > li (same)</span>
|
||
</span><span class="code-line line-number" line="3">//ul/following-sibling::li <span class="token comment"># ul ~ li</span>
|
||
</span><span class="code-line line-number" line="4">//ul/descendant-or-self::li <span class="token comment"># ul li</span>
|
||
</span><span class="code-line line-number" line="5">//ul/ancestor-or-self::li <span class="token comment"># $('ul').closest('li')</span>
|
||
</span></code></pre>
|
||
<hr>
|
||
<table>
|
||
<thead>
|
||
<tr>
|
||
<th></th>
|
||
<th></th>
|
||
<th></th>
|
||
<th></th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr>
|
||
<td><code>//</code></td>
|
||
<td><code>ul</code></td>
|
||
<td><code>/child::</code></td>
|
||
<td><code>li</code></td>
|
||
</tr>
|
||
<tr>
|
||
<td>Axis</td>
|
||
<td>Step</td>
|
||
<td>Axis</td>
|
||
<td>Step</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<p>表达式的步骤由 <code>/</code> 分隔，通常用于选择子节点。 这并不总是正确的：您可以使用 <code>::</code> 指定不同的“轴”。</p>
|
||
</div></div></div><div class="wrap"><div class="wrap-header h3wrap"><h3 id="子轴"><a aria-hidden="true" tabindex="-1" href="#子轴"><span class="icon icon-link"></span></a>子轴</h3><div class="wrap-body">
|
||
<pre class="language-bash"><code class="language-bash code-highlight"><span class="code-line line-number" line="1"><span class="token comment"># 都一样</span>
|
||
</span><span class="code-line line-number" line="2">//ul/li/a
|
||
</span><span class="code-line line-number" line="3">//child::ul/child::li/child::a
|
||
</span></code></pre>
|
||
<p><code>child::</code> is the default axis. This makes <code>//a/b/c</code> work.</p>
|
||
<pre class="language-bash"><code class="language-bash code-highlight"><span class="code-line line-number" line="1"><span class="token comment"># 都一样</span>
|
||
</span><span class="code-line line-number" line="2"><span class="token comment"># 这是因为 `child::li` 是真实的</span>
|
||
</span><span class="code-line line-number" line="3">//ul<span class="token punctuation">[</span>li<span class="token punctuation">]</span>
|
||
</span><span class="code-line line-number" line="4">//ul<span class="token punctuation">[</span>child::li<span class="token punctuation">]</span>
|
||
</span></code></pre>
|
||
<pre class="language-bash"><code class="language-bash code-highlight"><span class="code-line line-number" line="1"><span class="token comment"># 都一样</span>
|
||
</span><span class="code-line line-number" line="2">//ul<span class="token punctuation">[</span>count<span class="token punctuation">(</span>li<span class="token punctuation">)</span> <span class="token operator">></span> <span class="token number">2</span><span class="token punctuation">]</span>
|
||
</span><span class="code-line line-number" line="3">//ul<span class="token punctuation">[</span>count<span class="token punctuation">(</span>child::li<span class="token punctuation">)</span> <span class="token operator">></span> <span class="token number">2</span><span class="token punctuation">]</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap"><div class="wrap-header h3wrap"><h3 id="后代或自我轴"><a aria-hidden="true" tabindex="-1" href="#后代或自我轴"><span class="icon icon-link"></span></a>后代或自我轴</h3><div class="wrap-body">
|
||
<pre class="language-bash"><code class="language-bash code-highlight"><span class="code-line line-number" line="1"><span class="token comment"># 都一样</span>
|
||
</span><span class="code-line line-number" line="2">//div//h4
|
||
</span><span class="code-line line-number" line="3">//div/descendant-or-self::h4
|
||
</span></code></pre>
|
||
<p><code>//</code> 是 <code>descendant-or-self::</code> 轴的缩写。</p>
|
||
<pre class="language-bash"><code class="language-bash code-highlight"><span class="code-line line-number" line="1"><span class="token comment"># 都一样</span>
|
||
</span><span class="code-line line-number" line="2">//ul//<span class="token punctuation">[</span>last<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">]</span>
|
||
</span><span class="code-line line-number" line="3">//ul/descendant-or-self::<span class="token punctuation">[</span>last<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">]</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap row-span-2"><div class="wrap-header h3wrap"><h3 id="其他轴"><a aria-hidden="true" tabindex="-1" href="#其他轴"><span class="icon icon-link"></span></a>其他轴</h3><div class="wrap-body"><!--rehype:wrap-class=row-span-2-->
|
||
<table class="show-header">
|
||
<thead>
|
||
<tr>
|
||
<th>Axis</th>
|
||
<th>Abbrev</th>
|
||
<th>Notes</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr>
|
||
<td><code>ancestor</code></td>
|
||
<td></td>
|
||
<td></td>
|
||
</tr>
|
||
<tr>
|
||
<td><code>ancestor-or-self</code></td>
|
||
<td></td>
|
||
<td></td>
|
||
</tr>
|
||
<tr>
|
||
<td><code>attribute</code></td>
|
||
<td><code>@</code></td>
|
||
<td><code>@href</code> 是 <code>attribute::href</code> 的缩写</td>
|
||
</tr>
|
||
<tr>
|
||
<td><code>child</code></td>
|
||
<td></td>
|
||
<td><code>div</code> 是 <code>child::div</code> 的缩写</td>
|
||
</tr>
|
||
<tr>
|
||
<td><code>descendant</code></td>
|
||
<td></td>
|
||
<td></td>
|
||
</tr>
|
||
<tr>
|
||
<td><code>descendant-or-self</code></td>
|
||
<td><code>//</code></td>
|
||
<td><code>//</code> 是 <code>/descendant-or-self::node()/</code>的缩写</td>
|
||
</tr>
|
||
<tr>
|
||
<td><code>namespace</code></td>
|
||
<td></td>
|
||
<td></td>
|
||
</tr>
|
||
<tr>
|
||
<td><code>self</code></td>
|
||
<td><code>.</code></td>
|
||
<td><code>.</code> 是 <code>self::node()</code> 的缩写</td>
|
||
</tr>
|
||
<tr>
|
||
<td><code>parent</code></td>
|
||
<td><code>..</code></td>
|
||
<td><code>..</code> 是 <code>parent::node()</code> 的缩写</td>
|
||
</tr>
|
||
<tr>
|
||
<td><code>following</code></td>
|
||
<td></td>
|
||
<td></td>
|
||
</tr>
|
||
<tr>
|
||
<td><code>following-sibling</code></td>
|
||
<td></td>
|
||
<td></td>
|
||
</tr>
|
||
<tr>
|
||
<td><code>preceding</code></td>
|
||
<td></td>
|
||
<td></td>
|
||
</tr>
|
||
<tr>
|
||
<td><code>preceding-sibling</code></td>
|
||
<td></td>
|
||
<td></td>
|
||
</tr>
|
||
</tbody>
|
||
</table><!--rehype:className=show-header-->
|
||
<p>您还可以使用其他轴。</p>
|
||
</div></div></div><div class="wrap"><div class="wrap-header h3wrap"><h3 id="联合"><a aria-hidden="true" tabindex="-1" href="#联合"><span class="icon icon-link"></span></a>联合</h3><div class="wrap-body">
|
||
<pre class="language-bash"><code class="language-bash code-highlight"><span class="code-line line-number" line="1">//a <span class="token operator">|</span> //span
|
||
</span></code></pre>
|
||
<p>使用 <code>|</code> 连接两个表达式。</p>
|
||
</div></div></div></div></div><div class="wrap"><div class="wrap-header h2wrap"><h2 id="xpath-更多示例"><a aria-hidden="true" tabindex="-1" href="#xpath-更多示例"><span class="icon icon-link"></span></a>XPath 更多示例</h2><div class="wrap-body"><!--rehype:body-class=cols-2-->
|
||
</div></div><div class="h2wrap-body cols-2"><div class="wrap"><div class="wrap-header h3wrap"><h3 id="示例"><a aria-hidden="true" tabindex="-1" href="#示例"><span class="icon icon-link"></span></a>示例</h3><div class="wrap-body">
|
||
<pre class="language-bash"><code class="language-bash code-highlight"><span class="code-line line-number" line="1">//* <span class="token comment"># 所有元素</span>
|
||
</span><span class="code-line line-number" line="2">count<span class="token punctuation">(</span>//*<span class="token punctuation">)</span> <span class="token comment"># 计算所有元素</span>
|
||
</span><span class="code-line line-number" line="3"><span class="token punctuation">(</span>//h1<span class="token punctuation">)</span><span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span>/text<span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token comment"># 第一个 h1 标题的文本</span>
|
||
</span><span class="code-line line-number" line="4">//li<span class="token punctuation">[</span>span<span class="token punctuation">]</span> <span class="token comment"># 找到一个 <li> 里面有一个 <span></span>
|
||
</span><span class="code-line line-number" line="5"> <span class="token comment"># ...扩展到 //li[child::span]</span>
|
||
</span><span class="code-line line-number" line="6">//ul/li/<span class="token punctuation">..</span> <span class="token comment"># 使用 .. 选择父级</span>
|
||
</span></code></pre>
|
||
</div></div></div><div class="wrap"><div class="wrap-header h3wrap"><h3 id="查找父家长"><a aria-hidden="true" tabindex="-1" href="#查找父家长"><span class="icon icon-link"></span></a>查找(父)家长</h3><div class="wrap-body">
|
||
<pre class="language-bash"><code class="language-bash code-highlight"><span class="code-line line-number" line="1">//section<span class="token punctuation">[</span>h1<span class="token punctuation">[</span>@id<span class="token operator">=</span><span class="token string">'section-name'</span><span class="token punctuation">]</span><span class="token punctuation">]</span>
|
||
</span></code></pre>
|
||
<p>查找直接包含 <code>h1#section-name</code> 的 <code><section></code></p>
|
||
<pre class="language-bash"><code class="language-bash code-highlight"><span class="code-line line-number" line="1">//section<span class="token punctuation">[</span>//h1<span class="token punctuation">[</span>@id<span class="token operator">=</span><span class="token string">'section-name'</span><span class="token punctuation">]</span><span class="token punctuation">]</span>
|
||
</span></code></pre>
|
||
<p>
|
||
查找包含 <code>h1#section-name</code> 的 <code><section></code>。
|
||
（与上面相同，但使用后代或自我而不是孩子）
|
||
</p>
|
||
</div></div></div><div class="wrap"><div class="wrap-header h3wrap"><h3 id="最近的"><a aria-hidden="true" tabindex="-1" href="#最近的"><span class="icon icon-link"></span></a>最近的</h3><div class="wrap-body">
|
||
<pre class="language-bash"><code class="language-bash code-highlight"><span class="code-line line-number" line="1">./ancestor-or-self::<span class="token punctuation">[</span>@class<span class="token operator">=</span><span class="token string">"box"</span><span class="token punctuation">]</span>
|
||
</span></code></pre>
|
||
<p>像 <code>jQuery</code> 的 <code>$().closest('.box')</code> 一样工作。</p>
|
||
</div></div></div><div class="wrap"><div class="wrap-header h3wrap"><h3 id="属性"><a aria-hidden="true" tabindex="-1" href="#属性"><span class="icon icon-link"></span></a>属性</h3><div class="wrap-body">
|
||
<pre class="language-bash"><code class="language-bash code-highlight"><span class="code-line line-number" line="1">//item<span class="token punctuation">[</span>@price <span class="token operator">></span> <span class="token number">2</span>*@discount<span class="token punctuation">]</span>
|
||
</span></code></pre>
|
||
<p>查找 <code><item></code> 并检查其属性</p>
|
||
</div></div></div></div></div><div class="wrap"><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="https://devhints.io/xpath">Devhints</a> <em>(devhints.io)</em></li>
|
||
<li><a href="http://www.whitebeam.org/library/guide/TechNotes/xpathtestbed.rhtm">Xpath test bed</a> <em>(whitebeam.org)</em></li>
|
||
</ul>
|
||
|
||
</div></div></div></div></div><footer class="footer-wrap"><footer class="max-container">© 2022 Kenny Wang, All rights reserved.</footer></footer></body>
|
||
</html>
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