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+---
+title: MouseEvent.ctrlKey
+slug: Web/API/MouseEvent/ctrlKey
+translation_of: Web/API/MouseEvent/ctrlKey
+---
+<p>{{APIRef("DOM Events")}}</p>
+
+<p><code><font face="Open Sans, arial, sans-serif">鼠标事件</font><strong>ctrlKey是只读属性，可返回一个布尔值，当ctrl键被按下，返回true，否则返回false</strong></code></p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">var <em>ctrlKeyPressed</em> = <em>instanceOfMouseEvent</em>.ctrlKey
+</pre>
+
+<h3 id="返回值">返回值</h3>
+
+<p>A boolean</p>
+
+<h2 id="Example" name="Example">示例</h2>
+
+<pre class="brush: js">&lt;html&gt;
+&lt;head&gt;
+&lt;title&gt;ctrlKey example&lt;/title&gt;
+
+&lt;script type="text/javascript"&gt;
+
+function showChar(e){
+  alert(
+    "Key Pressed: " + String.fromCharCode(e.charCode) + "\n"
+    + "charCode: " + e.charCode + "\n"
+    + "CTRL key pressed: " + e.ctrlKey + "\n"
+  );
+}
+
+&lt;/script&gt;
+&lt;/head&gt;
+
+&lt;body onkeypress="showChar(event);"&gt;
+&lt;p&gt;Press any character key, with or without holding down the CTRL key.&lt;br /&gt;
+You can also use the SHIFT key together with the CTRL key.&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('DOM3 Events','#widl-MouseEvent-ctrlKey','MouseEvent.ctrlKey')}}</td>
+   <td>{{Spec2('DOM3 Events')}}</td>
+   <td>No change from {{SpecName('DOM2 Events')}}.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('DOM2 Events','#Events-MouseEvent','MouseEvent.ctrlKey')}}</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>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>{{CompatVersionUnknown()}}</td>
+   <td>{{CompatVersionUnknown()}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</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>{{ CompatUnknown() }}</td>
+   <td>{{ CompatUnknown() }}</td>
+   <td>{{ CompatUnknown() }}</td>
+   <td>{{ CompatUnknown() }}</td>
+   <td>{{ CompatUnknown() }}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="See_also" name="See_also">相关链接</h2>
+
+<ul>
+ <li>{{ domxref("MouseEvent") }}</li>
+</ul>