---
title: MouseEvent.screenY
slug: Web/API/MouseEvent/screenY
tags:
  - API
  - 参考
  - 属性
  - 鼠标
  - 鼠标事件
translation_of: Web/API/MouseEvent/screenY
---
<p>{{APIRef("DOM Events")}}</p>

<p> <strong><code>screenX</code></strong> 是 <a href="/zh-CN/docs/Web/API/MouseEvent"><code>MouseEvent</code></a> 的只读属性，提供鼠标在全局（屏幕）中的水平坐标（偏移量）。</p>

<h2 id="语法">语法</h2>

<pre class="syntaxbox notranslate">var <em>pixelNumber</em> = <em>instanceOfMouseEvent</em>.screenY
</pre>

<h3 id="返回值">返回值</h3>

<p>一个<code>double</code>值。早期版本的规范定义将其一个整数值的像素数。有关详细信息，请参见浏览器兼容性部分。</p>

<h2 id="示例">示例</h2>

<p>这个例子展示了当触发 {{Event("mousemove")}} 事件时鼠标的坐标。</p>

<h3 id="HTML">HTML</h3>

<pre class="notranslate">&lt;p&gt;Move your mouse to see its position.&lt;/p&gt;
&lt;p id="screen-log"&gt;&lt;/p&gt;</pre>

<h3 id="JavaScript">JavaScript</h3>

<pre class="notranslate">let screenLog = document.querySelector('#screen-log');
document.addEventListener('mousemove', logKey);

function logKey(e) {
  screenLog.innerText = `
    Screen X/Y: ${e.screenX}, ${e.screenY}
    Client X/Y: ${e.clientX}, ${e.clientY}`;
}</pre>

<h3 id="结果">结果</h3>

<p>{{EmbedLiveSample("Example")}}</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-screeny', 'screenY')}}</td>
   <td>{{Spec2('CSSOM View')}}</td>
   <td>Redefines {{domxref("MouseEvent")}} from long to double. </td>
  </tr>
  <tr>
   <td>{{SpecName('DOM3 Events','#widl-MouseEvent-screenY','MouseEvent.screenY')}}</td>
   <td>{{Spec2('DOM3 Events')}}</td>
   <td>No change from {{SpecName('DOM2 Events')}}.</td>
  </tr>
  <tr>
   <td>{{SpecName('DOM2 Events','#Events-MouseEvent','MouseEvent.sceenY')}}</td>
   <td>{{Spec2('DOM2 Events')}}</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>Edge</th>
   <th>Firefox (Gecko)</th>
   <th>Chrome</th>
   <th>Internet Explorer</th>
   <th>Opera</th>
   <th>Safari</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown()}}</td>
   <td>{{CompatVersionUnknown()}}</td>
   <td>6</td>
   <td>{{CompatVersionUnknown()}}</td>
   <td>{{CompatVersionUnknown()}}</td>
  </tr>
 </tbody>
</table>
</div>

<div id="compat-mobile">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Edge</th>
   <th>Firefox Mobile (Gecko)</th>
   <th>Android</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>{{CompatVersionUnknown()}}</td>
   <td>{{CompatVersionUnknown()}}</td>
   <td>{{CompatVersionUnknown()}}</td>
  </tr>
 </tbody>
</table>
</div>

<h2 id="See_also" name="See_also">参见</h2>

<ul>
 <li>{{ domxref("MouseEvent") }}</li>
 <li>{{ domxref("MouseEvent.screenX","screenX") }}</li>
 <li>{{ domxref("MouseEvent.clientX","clientX") }} / {{ domxref("MouseEvent.clientY", "clientY") }}</li>
</ul>