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+---
+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>