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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>
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