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+---
+title: MouseEvent.shiftKey
+slug: Web/API/MouseEvent/shiftKey
+translation_of: Web/API/MouseEvent/shiftKey
+---
+<p>{{APIRef("DOM Events")}}</p>
+
+<p><strong><code>MouseEvent.shiftKey</code></strong>は読み取り専用のプロパティです。  <kbd>shift</kbd> キーが押された (<code>true</code>) か離されている (<code>false</code>) かを各イベント時に表します。</p>
+
+<h2 id="文法">文法</h2>
+
+<pre class="syntaxbox">var <em>shiftKeyPressed</em> = <em>instanceOfMouseEvent</em>.shiftKey
+</pre>
+
+<h3 id="返り値">返り値</h3>
+
+<p>A boolean</p>
+
+<h2 id="Example" name="Example">使用例</h2>
+
+<pre class="brush: js">&lt;html&gt;
+&lt;head&gt;
+&lt;title&gt;shiftKey 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"
+ + "SHIFT key pressed: " + e.shiftKey + "\n"
+ + "ALT key pressed: " + e.altKey + "\n"
+ );
+}
+
+&lt;/script&gt;
+&lt;/head&gt;
+
+&lt;body onkeypress="showChar(event);"&gt;
+&lt;p&gt;シフトキーを押しながらアルファベットキーを押してみてください。&lt;br /&gt;
+同様に Altキーとも同時に使うことができます。&lt;/p&gt;
+&lt;/body&gt;
+&lt;/html&gt;
+</pre>
+
+<h2 id="仕様">仕様</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">仕様</th>
+ <th scope="col">ステータス</th>
+ <th scope="col">注釈</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('DOM3 Events','#widl-MouseEvent-shiftKey','MouseEvent.shiftKey')}}</td>
+ <td>{{Spec2('DOM3 Events')}}</td>
+ <td>次から変更なし{{SpecName('DOM2 Events')}}.</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('DOM2 Events','#Events-MouseEvent','MouseEvent.shiftKey')}}</td>
+ <td>{{Spec2('DOM2 Events')}}</td>
+ <td>初期の定義</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">ブラウザの互換性</h2>
+
+<p>{{Compat("api.MouseEvent.shiftKey")}}</p>
+
+<h2 id="See_also" name="See_also">参考</h2>
+
+<ul>
+ <li>{{ domxref("MouseEvent") }}</li>
+</ul>