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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
browser-compat: javascript.operators.remainder_assignment
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")}}

## 構文

```js
x %= y // x = x % y
```

## 例

### 剰余代入の使用

```js
// 以下の変数を想定
//  bar = 5

bar %= 2     // 1
bar %= 'foo' // NaN
bar %= 0     // NaN
```

## 仕様書

{{Specifications}}

## ブラウザーの互換性

{{Compat}}

## 関連情報

- [JavaScript ガイドの代入演算子](/ja/docs/Web/JavaScript/Guide/Expressions_and_Operators#assignment)
- [剰余演算子](/ja/docs/Web/JavaScript/Reference/Operators/Remainder)