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+---
+title: ビット論理積代入 (&=)
+slug: Web/JavaScript/Reference/Operators/Bitwise_AND_assignment
+tags:
+  - Assignment operator
+  - JavaScript
+  - Language feature
+  - Operator
+  - Reference
+  - 代入演算子
+  - 演算子
+  - 言語機能
+translation_of: Web/JavaScript/Reference/Operators/Bitwise_AND_assignment
+---
+<div>{{jsSidebar("Operators")}}</div>
+
+<p>ビット論理積代入演算子 (<code>&amp;=</code>) は、両方のオペランドのバイナリ表現を使用し、それらに対してビット単位の AND 演算を実行して、結果を変数に代入します。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/expressions-bitwise-and-assignment.html")}}</div>
+
+<div></div>
+
+
+
+<h2 id="構文">構文</h2>
+
+<pre class="syntaxbox notranslate"><strong>Operator:</strong> x &amp;= y
+<strong>Meaning:</strong>  x  = x &amp; y
+</pre>
+
+<h2 id="例">例</h2>
+
+<h3 id="ビット論理積代入の使用">ビット論理積代入の使用</h3>
+
+<pre class="brush: js notranslate">let a = 5;
+// 5:     00000000000000000000000000000101
+// 2:     00000000000000000000000000000010
+a &amp;= 2; // 0</pre>
+
+<h2 id="仕様">仕様</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">仕様書</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-assignment-operators', 'Assignment operators')}}</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="ブラウザーの互換性">ブラウザーの互換性</h2>
+
+
+
+<p>{{Compat("javascript.operators.bitwise_and_assignment")}}</p>
+
+<h2 id="関連項目">関連項目</h2>
+
+<ul>
+ <li><a href="https://developer.mozilla.org/ja/docs/Web/JavaScript/Guide/Expressions_and_Operators#Bitwise_operators">ビット演算子ガイド</a></li>
+ <li><a href="/ja/docs/Web/JavaScript/Reference/Operators/Bitwise_AND">ビット論理積演算子</a></li>
+</ul>