files/zh-cn/web/api/node/isequalnode/index.html


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---
title: Node.isEqualNode
slug: Web/API/Node/isEqualNode
tags:
  - API
  - DOM
  - Node
  - 参考
  - 方法
  - 节点
translation_of: Web/API/Node/isEqualNode
---
<div>{{ ApiRef("DOM") }}</div>

<p> <code><strong>Node.isEqualNode() </strong></code>方法可以判断两个节点是否相等。当两个节点的类型相同，定义特征(defining characteristics)相同（对元素来说，即 id，孩子节点的数量等等），属性一致等，这两个节点就是相等的。一些具体的数据指出：多数时候的比较是根据节点的类型来的。</p>

<h3 id="语法">语法</h3>

<pre class="syntaxbox">var <em>isEqualNode</em> = <em>node</em>.isEqualNode(<var>otherNode</var>);
</pre>

<ul>
 <li><font face="Consolas, Liberation Mono, Courier, monospace">otherNode: </font>比较是否相等的节点.</li>
</ul>

<h2 id="示例">示例</h2>

<p>在本例中，我们创建了三个 {{HTMLElement("div")}} 块。第一个和第三个 div 都拥有相同的内容和属性，第二个则不一样。然后我们运行 JavaScript ，使用 <code>isEqualNode()</code> 来比较这几个节点。</p>

<h3 id="HTML">HTML</h3>

<pre class="brush: html">&lt;div&gt;This is the first element.&lt;/div&gt;
&lt;div&gt;This is the second element.&lt;/div&gt;
&lt;div&gt;This is the first element.&lt;/div&gt;

&lt;p id="output"&gt;&lt;/p&gt;</pre>

<h3 id="JavaScript">JavaScript</h3>

<pre class="brush: js">let output = document.getElementById("output");
let divList  = document.getElementsByTagName("div");

output.innerHTML += "div 0 equals div 0: " + divList[0].isEqualNode(divList[0]) + "&lt;br/&gt;";
output.innerHTML += "div 0 equals div 1: " + divList[0].isEqualNode(divList[1]) + "&lt;br/&gt;";
output.innerHTML += "div 0 equals div 2: " + divList[0].isEqualNode(divList[2]) + "&lt;br/&gt;";</pre>

<h3 id="结果">结果</h3>

<p>{{ EmbedLiveSample('示例', 480) }}</p>

<h3 id="规范">规范</h3>

<table class="standard-table">
 <thead>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Status</th>
   <th scope="col">Comment</th>
  </tr>
 </thead>
 <tbody>
  <tr>
   <td>{{SpecName('DOM WHATWG', '#dom-node-isequalnode', 'Node.isEqualNode')}}</td>
   <td>{{Spec2('DOM WHATWG')}}</td>
   <td></td>
  </tr>
 </tbody>
</table>

<h2 id="浏览器支持">浏览器支持</h2>

<p>{{CompatibilityTable}}</p>

<div id="compat-desktop">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Chrome</th>
   <th>Firefox (Gecko)</th>
   <th>Internet Explorer</th>
   <th>Opera</th>
   <th>Safari</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatGeckoDesktop("1.9")}}</td>
   <td>9.0</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
  </tr>
 </tbody>
</table>
</div>

<div id="compat-mobile">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Android</th>
   <th>Firefox Mobile (Gecko)</th>
   <th>IE Mobile</th>
   <th>Opera Mobile</th>
   <th>Safari Mobile</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
  </tr>
 </tbody>
</table>
</div>

<h2 id="相关链接">相关链接</h2>

<ul>
 <li>{{domxref("Node.isSameNode()")}}</li>
</ul>