除算代入 (/=)
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
除算代入演算子 (/=
) は変数を右オペランドの値で除算し、結果をその変数に代入します。
試してみましょう
let a = 3;
a /= 2;
console.log(a);
// Expected output: 1.5
a /= 0;
console.log(a);
// Expected output: Infinity
a /= "hello";
console.log(a);
// Expected output: NaN
構文
js
x /= y; // x = x / y
例
除算代入の使用
js
// 以下の変数があり、すべての演算がこの順に実行されると想定する
// bar = 5
bar /= 2; // 2.5
bar /= 2; // 1.25
bar /= 0; // Infinity
bar /= "foo"; // NaN
仕様書
Specification |
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ECMAScript® 2025 Language Specification # sec-assignment-operators |
ブラウザーの互換性
Report problems with this compatibility data on GitHubdesktop | mobile | server | ||||||||||||
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Division assignment ( x /= y ) |
Legend
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- Full support
- Full support
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.