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----
-title: 減算代入 (-=)
-slug: Web/JavaScript/Reference/Operators/Subtraction_assignment
-tags:
-  - Assignment operator
-  - JavaScript
-  - Language feature
-  - Operator
-  - Reference
-translation_of: Web/JavaScript/Reference/Operators/Subtraction_assignment
----
-<div>{{jsSidebar("Operators")}}</div>
-
-<p>減算代入演算子 (<code>-=</code>) は、変数から右辺のオペランドの値を減算し、結果を変数に代入します。</p>
-
-<div>{{EmbedInteractiveExample("pages/js/expressions-subtraction-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="減算代入の使用">減算代入の使用</h3>
-
-<pre class="brush: js notranslate">// 次の変数を想定
-//  bar = 5
-
-bar -= 2     // 3
-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="ブラウザーの互換性">ブラウザーの互換性</h2>
-
-
-
-<p>{{Compat("javascript.operators.subtraction_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">代入演算子</a></li>
- <li><a href="/ja/docs/Web/JavaScript/Reference/Operators/Subtraction">減算演算子</a></li>
-</ul>