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---
title: IntersectionObserver.root
slug: Web/API/IntersectionObserver/root
translation_of: Web/API/IntersectionObserver/root
---
<p><code>root</code> 属性用来获取当前 <code>intersectionObserver</code> 实例的根元素。</p>
<h2 id="语法">语法</h2>
<pre class="syntaxbox"><var>intersectionObserver</var>.root;
</pre>
<h2 id="规范">规范</h2>
<table class="standard-table">
<tbody>
<tr>
<th scope="col">Specification</th>
<th scope="col">Status</th>
<th scope="col">Comment</th>
</tr>
<tr>
<td>{{SpecName('IntersectionObserver', '#dom-intersectionobserver-root', 'IntersectionObserver')}}</td>
<td>{{Spec2('IntersectionObserver')}}</td>
<td>Initial definition</td>
</tr>
</tbody>
</table>
<h2 id="浏览器兼容性">浏览器兼容性</h2>
<div>{{CompatibilityTable}}</div>
<div id="compat-desktop">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Chrome</th>
<th>Edge</th>
<th>Firefox (Gecko)</th>
<th>Internet Explorer</th>
<th>Opera</th>
<th>Safari (WebKit)</th>
</tr>
<tr>
<td>Basic support</td>
<td>{{CompatChrome(51.0)}}</td>
<td>{{CompatNo}}<sup>[1]</sup></td>
<td>{{CompatNo}}<sup>[2]</sup></td>
<td>{{CompatNo}}</td>
<td>{{CompatUnknown}}</td>
<td>{{CompatUnknown}}</td>
</tr>
</tbody>
</table>
</div>
<div id="compat-mobile">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Android</th>
<th>Android Webview</th>
<th>Firefox Mobile (Gecko)</th>
<th>Firefox OS</th>
<th>IE Mobile</th>
<th>Opera Mobile</th>
<th>Safari Mobile</th>
<th>Chrome for Android</th>
</tr>
<tr>
<td>Basic support</td>
<td>{{CompatNo}}</td>
<td>{{CompatChrome(51.0)}}</td>
<td>{{CompatNo}}<sup>[2]</sup></td>
<td>{{CompatNo}}</td>
<td>{{CompatNo}}</td>
<td>{{CompatUnknown}}</td>
<td>{{CompatUnknown}}</td>
<td>{{CompatChrome(51.0)}}</td>
</tr>
</tbody>
</table>
</div>
<p>[1] 实现于 <a href="https://developer.microsoft.com/en-us/microsoft-edge/platform/status/intersectionobserver/">Windows Insider Preview Build 14986</a>。</p>
<p>[2] 实现于 {{geckoRelease("53.0")}}，但默认处于关闭状态，需要打开<code>dom.IntersectionObserver.enabled。</code></p>
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