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+---
+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>