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---
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>
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