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doc: upate vue2.md (#122)

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v-for和v-if不推荐一起使用,效率较低.推荐使用computed计算属性.
当两者一起使用时v-for具有较高的优先级. 03d4aedc3d
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jaywcjlove
2022-11-18 02:53:43 +00:00
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@ -467,6 +467,7 @@
</span><span class="code-line"><span class="token tag"><span class="token tag"><span class="token punctuation">&#x3C;/</span>div</span><span class="token punctuation">></span></span>
</span></code></pre>
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="v-forv-if"><a aria-hidden="true" tabindex="-1" href="#v-forv-if"><span class="icon icon-link"></span></a>v-for/v-if</h3><div class="wrap-body">
<p><a href="https://v2.cn.vuejs.org/v2/guide/conditional.html">v-for和v-if不推荐一起使用</a></p>
<pre class="language-html"><code class="language-html code-highlight"><span class="code-line"><span class="token tag"><span class="token tag"><span class="token punctuation">&#x3C;</span>li</span>
</span></span><span class="code-line highlight-line"><span class="token tag"> <span class="token attr-name">v-for</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>todo in todos<span class="token punctuation">"</span></span>
</span></span><span class="code-line highlight-line"><span class="token tag"> <span class="token attr-name">v-if</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>!todo.isComplete<span class="token punctuation">"</span></span>