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---
title: MouseEvent.movementX
slug: Web/API/MouseEvent/movementX
translation_of: Web/API/MouseEvent/movementX
---
<p>{{APIRef("DOM Events")}}</p>
<p> <strong><code>MouseEvent.movementX</code></strong> 是只读属性，它提供了当前事件和上一个{{event("mousemove")}}事件之间鼠标在水平方向上的移动值。换句话说，这个值是这样计算的 : <code>currentEvent.movementX = currentEvent.screenX - previousEvent.screenX</code>.</p>
<h2 id="语法">语法</h2>
<pre class="syntaxbox">var <em>xShift</em> = <em>instanceOfMouseEvent</em>.movementX
</pre>
<h3 id="返回值">返回值</h3>
<p>一个数字</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('Pointer Lock','#widl-MouseEvent-movementX','MouseEvent.movementX')}}</td>
<td>{{Spec2('Pointer Lock')}}</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>{{CompatChrome(22.0)}} {{property_prefix("webkit")}}<br>
{{CompatChrome(37.0)}} unprefixed</td>
<td>{{CompatVersionUnknown}}</td>
<td>
<p>{{CompatGeckoDesktop(1.0)}} {{property_prefix("moz")}}<br>
{{CompatGeckoDesktop(41)}}</p>
</td>
<td>{{ CompatNo() }}</td>
<td>{{ CompatUnknown() }}</td>
<td>{{ CompatNo() }}</td>
</tr>
</tbody>
</table>
</div>
<div id="compat-mobile">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Android Webview</th>
<th>Edge</th>
<th>Firefox Mobile (Gecko)</th>
<th>IE Mobile</th>
<th>Opera Mobile</th>
<th>Safari Mobile</th>
<th>Chrome for Android</th>
</tr>
<tr>
<td>Basic support</td>
<td>{{CompatChrome(37)}}</td>
<td>{{CompatVersionUnknown}}</td>
<td>{{CompatGeckoMobile(1.0)}} {{property_prefix("moz")}}<br>
{{CompatGeckoMobile(41)}}</td>
<td>{{ CompatNo() }}</td>
<td>{{ CompatUnknown() }}</td>
<td>{{ CompatNo() }}</td>
<td>{{CompatVersionUnknown}} {{property_prefix("webkit")}}<br>
{{CompatChrome(37.0)}} unprefixed</td>
</tr>
</tbody>
</table>
</div>
<h2 id="See_also" name="See_also">相关</h2>
<ul>
<li>{{ domxref("MouseEvent") }}</li>
<li><a href="/en-US/docs/WebAPI/Pointer_Lock">Pointer Lock</a></li>
</ul>
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