---
title: Range.collapsed
slug: Web/API/Range/collapsed
translation_of: Web/API/Range/collapsed
---
<div>
<p>{{ APIRef("DOM") }}</p>
</div>

<p> <code><strong>Range.collapsed</strong></code> 是只读属性。它返回一个 {{domxref("Boolean")}} 值表示是否起始点和结束点是同一个位置。 如果返回 <code>true</code> 表示{{domxref("Range")}} 的起始位置和结束位置重合, <code>false</code> 表示不重合。</p>

<p> 一个折叠的{{domxref("Range")}} 是空的，不包含内容，表示Dom树中的一个点。collapsed 属性是只读的。可以调用 {{domxref("Range.collapse()")}} 方法来折叠选区。</p>

<h2 id="Syntax" name="Syntax">语法</h2>

<pre class="syntaxbox"><em>isCollapsed</em> = <em>range</em>.collapsed;
</pre>

<h2 id="Example" name="Example">例子</h2>

<pre class="brush:js">var range = document.createRange();

range.setStart(startNode,startOffset);
range.setEnd(endNode,endOffset);
isCollapsed = range.collapsed;
</pre>

<h2 id="Specification" name="Specification">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('DOM WHATWG', '#dom-range-collapsed', 'Range.collapsed')}}</td>
   <td>{{Spec2('DOM WHATWG')}}</td>
   <td>No change.</td>
  </tr>
  <tr>
   <td>{{SpecName('DOM2 Traversal_Range', 'ranges.html#Level-2-Range-attr-collapsed', 'Range.collapsed')}}</td>
   <td>{{Spec2('DOM2 Traversal_Range')}}</td>
   <td>Initial specification.</td>
  </tr>
 </tbody>
</table>

<h2 id="浏览器兼容性">浏览器兼容性</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("1.0")}}</td>
   <td>9.0</td>
   <td>9.0</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>{{CompatGeckoMobile("1.0")}}</td>
   <td>9.0</td>
   <td>9.0</td>
   <td>{{CompatVersionUnknown}}</td>
  </tr>
 </tbody>
</table>
</div>

<h2 id="参阅">参阅</h2>

<ul>
 <li><a href="/en-US/docs/DOM/DOM_Reference" title="/en-US/docs/DOM/DOM_Reference">The DOM interfaces index</a></li>
</ul>