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+---
+title: event.altKey
+slug: conflicting/Web/API/MouseEvent/altKey
+translation_of: Web/API/MouseEvent/altKey
+translation_of_original: Web/API/event.altKey
+original_slug: Web/API/event.altKey
+---
+<p>{{ ApiRef() }}</p>
+<h3 id="Summary" name="Summary">概述</h3>
+<p>表明当事件触发时,ALT键是否处于按下的状态.</p>
+<h3 id="Syntax" name="Syntax">语法</h3>
+<pre class="eval">event.altKey
+</pre>
+<h3 id="例子">例子</h3>
+<pre><code><em>var bool</em> = event.altKey;</code>
+</pre>
+<p>如果当事件触发时,ALT键处于按下的状态,<code style="font-family: 'Courier New','Andale Mono',monospace; font-style: normal; font-variant: normal; font-size: 100%; line-height: normal; color: inherit; font-weight: inherit;">则bool</code>的值为<code style="font-family: 'Courier New','Andale Mono',monospace; font-style: normal; font-variant: normal; font-size: 100%; line-height: normal; color: inherit; font-weight: inherit;">true,否则为</code><code style="font-family: 'Courier New','Andale Mono',monospace; font-style: normal; font-variant: normal; font-size: 100%; line-height: normal; color: inherit; font-weight: inherit;">false</code>.</p>
+<pre class="brush: html">&lt;html&gt;
+&lt;head&gt;
+&lt;title&gt;altKey 示例&lt;/title&gt;
+
+&lt;script type="text/javascript"&gt;
+
+function showChar(e){
+  alert(
+    "按下的键: " + String.fromCharCode(e.charCode) + "\n"
+    + "charCode: " + e.charCode + "\n"
+    + "是否按下ALT键: " + e.altKey + "\n"
+  );
+}
+
+&lt;/script&gt;
+&lt;/head&gt;
+
+&lt;body onkeypress="showChar(event);"&gt;
+&lt;p&gt;
+按下一个字符键,尝试同时按下ALT键.&lt;br /&gt;
+你也可以同时按下SHIFT键和ALT键.
+&lt;/p&gt;
+&lt;/body&gt;
+&lt;/html&gt;
+</pre>
+<h3 id="规范">规范</h3>
+<p>DOM Level 2 Events - property of MouseEvent object</p>
+<p>{{ languages( { "ja": "ja/DOM/event.altKey", "pl": "pl/DOM/event.altKey", "en": "en/DOM/event.altKey" } ) }}</p>