---
title: Selection.collapseToStart()
slug: Web/API/Selection/collapseToStart
tags:
  - API
  - Selection
  - 参考
  - 方法
translation_of: Web/API/Selection/collapseToStart
---
<div>{{ ApiRef("DOM") }}{{SeeCompatTable}}</div>

<p><strong><code>Selection.collapseToStart()</code></strong> 方法的作用是取消当前选区，并把光标定位在原选区的最开始处，如果此时光标所处的位置是可编辑的，且它获得了焦点，则光标会在原地闪烁。</p>

<h2 id="语法">语法</h2>

<pre class="syntaxbox"><var><var>sel</var></var>.collapseToStart()
</pre>

<h3 id="参数">参数</h3>

<p><em>无。</em></p>

<h2 id="规范">规范</h2>

<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">规范</th>
   <th scope="col">状态</th>
   <th scope="col">备注</th>
  </tr>
  <tr>
   <td>{{SpecName('Selection API', '#dom-selection-collapsetostart', 'Selection.collapseToStart()')}}</td>
   <td>{{Spec2('Selection API')}}</td>
   <td>Current</td>
  </tr>
 </tbody>
</table>

<h2 id="浏览器兼容性">浏览器兼容性</h2>



<p>{{Compat("api.Selection.collapseToStart")}}</p>

<h2 id="参见">参见</h2>

<ul>
 <li>此方法所属的接口，{{domxref("Selection")}}。</li>
</ul>