From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:40:17 -0500
Subject: initial commit

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+---
+title: KeyboardEvent.altKey
+slug: Web/API/KeyboardEvent/altKey
+tags:
+  - API
+  - DOM
+  - KeyboardEvent
+  - events
+  - 鼠标事件
+translation_of: Web/API/KeyboardEvent/altKey
+---
+<p id="Summary">{{APIRef("DOM Events")}}</p>
+
+<p><strong><code>KeyboardEvent.altKey</code></strong> 只读属性返回一个 {{jsxref("Boolean")}} 值，表示事件触发时 <kbd>alt</kbd> 键 (OS X系统上的 <kbd>Option</kbd> 或 <kbd>⌥</kbd> 键) 是 (<code>true</code>) 否 (<code>false</code>) 被按下。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">var <em>altKeyPressed</em> = <em>instanceOfKeyboardEvent</em>.altKey
+</pre>
+
+<h3 id="返回值">返回值</h3>
+
+<p>布尔值</p>
+
+<h2 id="示例">示例</h2>
+
+<pre class="brush: js">&lt;html&gt;
+&lt;head&gt;
+&lt;title&gt;altKey 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"
+    + "ALT key pressed: " + e.altKey + "\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 ALT key.&lt;br /&gt;
+You can also use the SHIFT key together with the ALT key.
+&lt;/p&gt;
+&lt;/body&gt;
+&lt;/html&gt;</pre>
+
+<h2 id="标准">标准</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-KeyboardEvent-altKey','KeyboardEvent.altkey')}}</td>
+   <td>{{Spec2('DOM3 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">特性
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Edge</th>
+   <th>Firefox (Gecko)</th>
+   <th>Chrome</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>基本支持</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown()}}</td>
+   <td>{{CompatVersionUnknown()}}</td>
+   <td>{{CompatVersionUnknown()}}</td>
+   <td>{{CompatVersionUnknown()}}</td>
+   <td>{{CompatVersionUnknown()}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">特性
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <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>基本支持</td>
+   <td>{{CompatVersionUnknown}}</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">参考</h2>
+
+<ul>
+ <li>{{ domxref("KeyboardEvent") }}</li>
+</ul>
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