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+---
+title: MouseEvent.clientY
+slug: Web/API/MouseEvent/clientY
+tags:
+  - CSSOM View
+  - MouseEvent
+translation_of: Web/API/MouseEvent/clientY
+---
+<p>{{APIRef("DOM Events")}}</p>
+
+<p><strong><code>MouseEvent.clientY</code></strong> 是只读属性， 它提供事件发生时的应用客户端区域的垂直坐标 (与页面坐标不同)。例如，当你点击客户端区域的左上角时，鼠标事件的 <code>clientY</code> 值为 0 ，这一值与页面是否有垂直滚动无关。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">var <em>y</em> = <em>instanceOfMouseEvent</em>.clientY
+</pre>
+
+<h3 id="Return_value">Return value</h3>
+
+<p>被 CSSOM View Module 重新定义为一个 <code>double</code> 类型的浮点值. 原来这个属性是被定义为一个 <code>long</code> 整数. 可以在 "浏览器兼容性" 那里查看详细内容.</p>
+
+<h3 id="Example" name="Example">Example</h3>
+
+<pre class="brush: js">&lt;html&gt;
+&lt;head&gt;
+&lt;title&gt;clientX\clientY example&lt;/title&gt;
+
+&lt;script type="text/javascript"&gt;
+function showCoords(evt){
+  alert(
+    "clientX value: " + evt.clientX + "\n"
+    + "clientY value: " + evt.clientY + "\n"
+  );
+}
+&lt;/script&gt;
+&lt;/head&gt;
+
+&lt;body onmousedown="showCoords(event)"&gt;
+&lt;p&gt;To display the mouse coordinates click anywhere on the page.&lt;/p&gt;
+&lt;/body&gt;
+&lt;/html&gt;
+</pre>
+
+<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-clienty', 'clientY')}}</td>
+   <td>{{Spec2('CSSOM View')}}</td>
+   <td>Redefines {{domxref("MouseEvent")}} from <code>long</code> to <code>double</code>.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('DOM3 Events','#widl-MouseEvent-clientY','MouseEvent.clientY')}}</td>
+   <td>{{Spec2('DOM3 Events')}}</td>
+   <td>No change from {{SpecName('DOM2 Events')}}.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('DOM2 Events','#Events-MouseEvent','MouseEvent.clientY')}}</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>{{Compat("api.MouseEvent.clientY")}}</p>
+
+<h2 id="See_also" name="See_also">查看更多</h2>
+
+<ul>
+ <li>{{ domxref("MouseEvent") }}</li>
+ <li>{{domxref("MouseEvent.clientX","clientX")}}</li>
+ <li>{{domxref("MouseEvent.screenX","screenX")}} / {{domxref("MouseEvent.screenY","screenY")}}</li>
+</ul>