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+---
+title: べき乗代入 (**=)
+slug: Web/JavaScript/Reference/Operators/Exponentiation_assignment
+tags:
+  - 代入演算子
+  - JavaScript
+  - 言語機能
+  - 演算子
+  - Reference
+translation_of: Web/JavaScript/Reference/Operators/Exponentiation_assignment
+---
+{{jsSidebar("Operators")}}
+
+べき乗代入演算子 (`**=`) は、変数の値を右辺のオペランドでべき乗します。
+
+{{EmbedInteractiveExample("pages/js/expressions-exponentiation-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="べき乗代入の仕様">べき乗代入の仕様</h3>
+
+<pre class="brush: js notranslate">// 次の変数を想定
+//  bar = 5
+
+bar **= 2     // 25
+bar **= 'foo' // 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="ブラウザー実装状況">ブラウザー実装状況</h2>
+
+
+
+{{Compat("javascript.operators.exponentiation_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">Assignment operators in the JS guide</a></li>
+ <li><a href="/ja/docs/Web/JavaScript/Reference/Operators/Exponentiation">Exponentiation operator</a></li>
+</ul>