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+---
+title: Selection.focusOffset
+slug: Web/API/Selection/focusOffset
+tags:
+  - HTML编辑
+  - 只读
+  - 属性
+  - 选区
+translation_of: Web/API/Selection/focusOffset
+---
+<div>
+<div>
+<div>{{ ApiRef("DOM") }}{{SeeCompatTable}}</div>
+</div>
+</div>
+
+<p>只读属性<strong><code>,</code></strong> 返回选区终点（鼠标松开瞬间所记录的那个点）在焦点（{{domxref("Selection.focusNode")}}）中的偏移量。返回值从零开始计数，如果选区（{{domxref("Selection")}}）在焦点（{{domxref("Selection.focusNode")}}）的第一个字符前结束，返回值为0。</p>
+
+<h2 id="Syntax" name="Syntax">语法</h2>
+
+<pre class="syntaxbox"><em>offset</em> =<em> sel</em>.focusOffset
+</pre>
+
+<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('HTML Editing', '#dom-selection-focusOffset', 'Selection.focusOffset')}}</td>
+   <td>{{Spec2('HTML Editing')}}</td>
+   <td>Initial definition</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('Selection API', '#widl-Selection-focusOffset', 'Selection.focusOffset')}}</td>
+   <td>{{Spec2('Selection API')}}</td>
+   <td>Current</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">浏览器兼容性</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>平台</th>
+   <th>Chrome</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari (WebKit)</th>
+  </tr>
+  <tr>
+   <td>最低支持版本</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatVersionUnknown()}}</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>平台</th>
+   <th>Android</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>Firefox OS</th>
+   <th>IE Phone</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>最低支持版本</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatVersionUnknown()}}</td>
+   <td>1.0</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="See_also" name="See_also">相关链接</h2>
+
+<ul>
+ <li>{{domxref("Selection")}}, 这个属性所属的接口。</li>
+</ul>