---
title: MouseEvent.pageY
slug: Web/API/MouseEvent/pageY
translation_of: Web/API/MouseEvent/pageY
---
<p>{{APIRef("DOM Events")}}</p>

<p><code><strong>pageY</strong></code>是一个只读属性，它返回触发事件的位置相对于整个 document 的 Y 坐标值。由于其参考物是整个 dom，所以这个值受页面垂直方向的滚动影响。例如：当你垂直方向向下滚动了 50 pixel，那么你在顶端进行点击的时候，获取的<code><strong>pageY</strong></code>为 50pixed 而不是 0。最初这个属性被定义为长整型（long integer），如今 <strong>CSSOM </strong>视图模块将其重新定义为双精度浮点数（double float）。你可以查阅浏览器兼容性部分的文档来进一步了解有关信息。</p>

<h2 id="Syntax" name="Syntax">语法</h2>

<pre class="syntaxbox">var <em>pos</em> = <em>event</em>.pageY</pre>

<h2 id="Syntax" name="Syntax">示例</h2>

<pre><em>var pageY</em> = <em>event</em>.pageY;</pre>

<h3 id="规范">规范</h3>

<table class="standard-table">
 <tbody>
  <tr>
   <th>Specification</th>
   <th>Status</th>
   <th>Comment</th>
  </tr>
  <tr>
   <td>{{SpecName('CSSOM View', '#dom-mouseevent-pagey', 'pageY')}}</td>
   <td>{{Spec2('CSSOM View')}}</td>
   <td>Redefined from <code>long</code> to <code>double</code>.</td>
  </tr>
  <tr>
   <td>{{SpecName('Touch Events', '#widl-Touch-pagey', 'pageY')}}</td>
   <td>{{Spec2('TouchEvents')}}</td>
   <td>Initial definition.</td>
  </tr>
 </tbody>
</table>

<h2 id="浏览器兼容性">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 (WebKit)</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatChrome(45)}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>9</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" style="line-height: 19.0909080505371px;">
<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>Firefox OS</th>
   <th>IE Mobile</th>
   <th>Opera Mobile</th>
   <th>Safari Mobile</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatChrome(45.)}}</td>
   <td>{{CompatChrome(45)}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</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>
   <td>{{CompatUnknown}}</td>
  </tr>
 </tbody>
</table>
</div>

<h2 id="更多请见">更多请见</h2>

<ul>
 <li>{{domxref("UIEvent.pageY")}}</li>
</ul>