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---
title: べき乗代入 (**=)
slug: Web/JavaScript/Reference/Operators/Exponentiation_assignment
tags:
- Assignment operator
- JavaScript
- Language feature
- Operator
- Reference
translation_of: Web/JavaScript/Reference/Operators/Exponentiation_assignment
---
<div>{{jsSidebar("Operators")}}</div>
<p>べき乗代入演算子 (<code>**=</code>) は、変数の値を右辺のオペランドでべき乗します。</p>
<div>{{EmbedInteractiveExample("pages/js/expressions-exponentiation-assignment.html")}}</div>
<div></div>
<h2 id="構文">構文</h2>
<pre class="syntaxbox notranslate"><strong>Operator:</strong> x **= y
<strong>Meaning:</strong> x = x ** y</pre>
<h2 id="例">例</h2>
<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>
<p>{{Compat("javascript.operators.exponentiation_assignment")}}</p>
<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>
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