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+---
+title: event.altKey
+slug: Web/API/MouseEvent/altKey
+tags:
+  - DOM
+  - Gecko
+  - Gecko DOM Reference
+translation_of: Web/API/MouseEvent/altKey
+---
+<p>{{ ApiRef() }}</p>
+<h3 id="Summary" name="Summary">Summary</h3>
+<p>イベントが発生したときALTキーが押されていたかどうかを示します。</p>
+<h3 id="Syntax" name="Syntax">Syntax</h3>
+<pre class="eval"><i>bool</i> = event.altKey
+</pre>
+<p><code>bool</code> は <code>true</code> か <code>false</code> であり、イベントが発生したときに ALT キーが押されていたかどうかを示しています。</p>
+<h3 id="Example" name="Example">Example</h3>
+<pre>&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>
+<p>{{ languages( { "en": "en/DOM/event.altKey", "pl": "pl/DOM/event.altKey" } ) }}</p>