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authorFlorian Merz <me@fiji-flo.de>2021-02-23 15:56:25 +0100
committerFlorian Merz <me@fiji-flo.de>2021-02-23 15:56:25 +0100
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+---
+title: NonDocumentTypeChildNode.previousElementSibling
+slug: Web/API/NonDocumentTypeChildNode/previousElementSibling
+translation_of: Web/API/NonDocumentTypeChildNode/previousElementSibling
+---
+<p>{{ ApiRef() }}</p>
+
+<h3 id="Summary" name="Summary">概述</h3>
+
+<p><strong>previousElementSibling</strong> 返回当前元素在其父元素的子元素节点中的前一个元素节点,如果该元素已经是第一个元素节点,则返回<code>null,</code>该属性是只读的.</p>
+
+<h3 id="Syntax_and_values" name="Syntax_and_values">语法</h3>
+
+<pre class="eval">var <em>prevNode</em> = elementNodeReference.previousElementSibling;
+</pre>
+
+<h3 id="Example" name="Example">例子</h3>
+
+<pre class="brush: html">&lt;div id="div-01"&gt;Here is div-01&lt;/div&gt;
+&lt;div id="div-02"&gt;Here is div-02&lt;/div&gt;
+&lt;li&gt;This is a list item&lt;/li&gt;
+&lt;li&gt;This is another list item&lt;/li&gt;
+&lt;div id="div-03"&gt;Here is div-03&lt;/div&gt;
+
+&lt;script type="text/javascript"&gt;
+ var el = document.getElementById('div-03').previousElementSibling;
+ document.write('&lt;p&gt;Siblings of div-03&lt;/p&gt;&lt;ol&gt;');
+ while (el) {
+ document.write('&lt;li&gt;' + el.nodeName + '&lt;/li&gt;');
+ el = el.previousElementSibling;
+ }
+ document.write('&lt;/ol&gt;');
+&lt;/script&gt;
+</pre>
+
+<p>上面的例子会输出以下内容:</p>
+
+<pre>Siblings of div-03
+
+ 1. LI
+ 2. LI
+ 3. DIV
+ 4. DIV
+</pre>
+
+<h3 id="Specification" name="Specification">浏览器兼容性</h3>
+
+<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>4</td>
+ <td>{{ CompatGeckoDesktop("1.9.1") }}</td>
+ <td>9</td>
+ <td>9.8</td>
+ <td>4</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table" style="font-family: 'Open Sans Light', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 16px;">
+ <tbody>
+ <tr>
+ <th style="line-height: 16px;">Feature</th>
+ <th style="line-height: 16px;">Android</th>
+ <th style="line-height: 16px;">Firefox Mobile (Gecko)</th>
+ <th style="line-height: 16px;">IE Mobile</th>
+ <th style="line-height: 16px;">Opera Mobile</th>
+ <th style="line-height: 16px;">Safari Mobile</th>
+ </tr>
+ <tr>
+ <td>Basic support (on {{domxref("Element")}})</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatGeckoMobile("1.9.1")}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>9.8</td>
+ <td>{{CompatVersionUnknown}}</td>
+ </tr>
+ <tr>
+ <td>Support on {{domxref("CharacterData")}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatGeckoMobile("25")}}</td>
+ <td>{{CompatNo}}</td>
+ <td>16.0</td>
+ <td>{{CompatNo}}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<h3 id="Specification" name="Specification">规范</h3>
+
+<p><a class="external" href="http://www.w3.org/TR/2008/REC-ElementTraversal-20081222/#attribute-previousElementSibling">Element Traversal Specification: previousElementSibling</a></p>
+
+<h3 id="相关链接">相关链接</h3>
+
+<ul>
+ <li><a class="internal" href="/zh-cn/DOM/Element.childElementCount" title="zh-cn/DOM/Element.childElementCount"><code>childElementCount</code></a></li>
+ <li><a class="internal" href="/zh-cn/DOM/Element.children" title="zh-cn/DOM/Element.children"><code>children</code></a></li>
+ <li><a class="internal" href="/zh-cn/DOM/Element.firstElementChild" title="zh-cn/DOM/Element.firstElementChild"><code>firstElementChild</code></a></li>
+ <li><a class="internal" href="/zh-cn/DOM/Element.lastElementChild" title="zh-cn/DOM/Element.lastElementChild"><code>lastElementChild</code></a></li>
+ <li><a class="internal" href="/zh-cn/DOM/Element.nextElementSibling" title="zh-cn/DOM/Element.nextElementSibling"><code>nextElementSibling</code></a></li>
+</ul>
+
+<p>{{ languages( {"en": "en/DOM/element.previousElementSibling" } ) }}</p>