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+---
+title: 剰余代入 (%=)
+slug: Web/JavaScript/Reference/Operators/Remainder_assignment
+tags:
+  - 代入演算子
+  - JavaScript
+  - 言語機能
+  - 演算子
+  - Reference
+translation_of: Web/JavaScript/Reference/Operators/Remainder_assignment
+---
+{{jsSidebar("Operators")}}
+
+剰余代入演算子 (`%=`) は、変数を右辺のオペランドの値で除算し、剰余を変数に代入します。
+
+{{EmbedInteractiveExample("pages/js/expressions-remainder-assignment.html")}}
+
+<div></div>
+
+
+
+## 構文
+
+<pre class="syntaxbox notranslate"><strong>Operator:</strong> x %= y
+<strong>Meaning:</strong>  x  = x % y</pre>
+
+## 例
+
+<h3 id="剰余代入の使用">剰余代入の使用</h3>
+
+<pre class="brush: js notranslate">// 以下の変数を想定
+//  bar = 5
+
+bar %= 2     // 1
+bar %= 'foo' // NaN
+bar %= 0     // NaN</pre>
+
+<h2 id="仕様">仕様</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">仕様</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>
+
+
+
+{{Compat("javascript.operators.remainder_assignment")}}
+
+<h2 id="関連項目">関連項目</h2>
+
+<ul>
+ <li><a href="/ja/docs/Web/JavaScript/Guide/Expressions_and_Operators#Assignment">代入演算子</a></li>
+ <li><a href="/ja/docs/Web/JavaScript/Reference/Operators/Remainder">剰余演算子</a></li>
+</ul>