---
title: selectstart
slug: Web/API/Document/selectstart_event
tags:
  - Selection
  - Selection API
  - events
translation_of: Web/API/Document/selectstart_event
---
<div>
<p><a href="https://developer.mozilla.org/en-US/docs/Web/API/Selection_API">Selection API</a> 的 <code><strong>selectstart</strong></code><strong> </strong>事件在用户开始一个新的选择时候触发。</p>

<p>如果事件被取消，选择将不被触发。</p>
</div>

<table class="standard-table">
 <tbody>
  <tr>
   <td>Bubbles</td>
   <td>Yes</td>
  </tr>
  <tr>
   <td>Cancelable</td>
   <td>Yes</td>
  </tr>
  <tr>
   <td>Target objects</td>
   <td>{{domxref("Document")}}</td>
  </tr>
  <tr>
   <td>Interface</td>
   <td>{{domxref("Event")}}</td>
  </tr>
 </tbody>
</table>

<h2 id="例子">例子</h2>

<pre class="brush: js">document.addEventListener("selectstart", function() {
  console.log('Selection started');
}, false);
</pre>

<h2 id="继承">继承</h2>

<p><code>selectstart</code> 事件实现{{domxref("Event")}} 接口. 你可以使用此界面上定义的属性和方法。</p>

<p>{{InheritanceDiagram('','','', 'Event')}}</p>

<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('Selection API', '#selectstart-event', 'selectstart')}}</td>
   <td>{{Spec2('Selection API')}}</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</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatGeckoDesktop("52")}}</td>
   <td>{{CompatUnknown}}</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>Chrome for Android</th>
   <th>Edge</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>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatGeckoMobile("52")}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
  </tr>
 </tbody>
</table>
</div>

<h2 id="参见">参见</h2>

<ul>
 <li>{{domxref("GlobalEventHandlers.onselectstart")}}</li>
</ul>