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+---
+title: MouseEvent.movementY
+slug: Web/API/MouseEvent/movementY
+translation_of: Web/API/MouseEvent/movementY
+---
+<p>{{APIRef("DOM Events")}}</p>
+
+<p><strong><code>MouseEvent.movementY</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.movementY = currentEvent.screenY - previousEvent.screenY</code>.</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">var <em>yShift</em> = <em>instanceOfMouseEvent</em>.movementY
+</pre>
+
+<h3 id="返回值">返回值</h3>
+
+<p>A number</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-movementY','MouseEvent.movementY')}}</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>{{CompatGeckoDesktop(1.0)}} {{property_prefix("moz")}}<br>
+    {{CompatGeckoDesktop(41)}}</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(37.0)}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoMobile(1.0)}} {{property_prefix("moz")}}<br>
+    {{CompatGeckoMobile(41)}}</td>
+   <td>{{ CompatUnknown() }}</td>
+   <td>{{ CompatUnknown() }}</td>
+   <td>{{ CompatUnknown() }}</td>
+   <td>{{CompatVersionUnknown}} {{property_prefix("webkit")}}<br>
+    {{CompatChrome(37.0)}} unprefixed</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="相关">相关</h2>
+
+<ul>
+ <li>{{ domxref("MouseEvent") }}</li>
+ <li><a href="/en-US/docs/WebAPI/Pointer_Lock">Pointer Lock</a></li>
+</ul>