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+---
+title: MouseEvent.offsetX
+slug: Web/API/MouseEvent/offsetX
+tags:
+  - API
+  - 只读
+  - 属性
+  - 鼠标事件
+translation_of: Web/API/MouseEvent/offsetX
+---
+<p>{{APIRef("DOM Events")}}{{SeeCompatTable}}</p>
+
+<p>{{domxref("MouseEvent")}} 接口的只读属性 <strong>offsetX </strong>规定了事件对象与目标节点的内填充边（padding edge）在 X 轴方向上的偏移量。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">var xOffset = <em>instanceOfMouseEvent</em>.offsetX;
+</pre>
+
+<h3 id="返回值">返回值</h3>
+
+<p>一个<code>双精度</code> 浮点值。早期的规范将其规定为整数值。详见浏览器兼容性部分。</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('CSSOM View', '#dom-mouseevent-offsetx', 'MouseEvent')}}</td>
+   <td>{{Spec2('CSSOM View')}}</td>
+   <td>Initial definition</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">浏览器兼容性</h2>
+
+<p>{{ CompatibilityTable() }}</p>
+
+<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>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoDesktop("39.0")}}</td>
+   <td>6</td>
+   <td>{{ CompatVersionUnknown() }}</td>
+   <td>{{ CompatVersionUnknown() }}</td>
+  </tr>
+  <tr>
+   <td>Redefined from <code>long</code> to <code>double</code></td>
+   <td>{{CompatChrome(56)}}</td>
+   <td>{{ CompatUnknown() }}</td>
+   <td>{{ CompatUnknown() }}</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 Webview</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>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoMobile("43.0")}}</td>
+   <td>{{ CompatUnknown() }}</td>
+   <td>{{ CompatUnknown() }}</td>
+   <td>{{ CompatUnknown() }}</td>
+  </tr>
+  <tr>
+   <td>Redefined from <code>long</code> to <code>double</code></td>
+   <td>{{CompatChrome(56)}}</td>
+   <td>{{CompatChrome(56)}}</td>
+   <td>{{ CompatUnknown() }}</td>
+   <td>{{ CompatUnknown() }}</td>
+   <td>{{ CompatUnknown() }}</td>
+   <td>{{ CompatUnknown() }}</td>
+   <td>{{ CompatUnknown() }}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="See_also" name="See_also">相关内容</h2>
+
+<ul>
+ <li>{{ domxref("MouseEvent") }}</li>
+</ul>