乗算 (*)
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.
乗算演算子 (*
) はオペランドの積を生成します。
試してみましょう
console.log(3 * 4);
// Expected output: 12
console.log(-3 * 4);
// Expected output: -12
console.log("3" * 2);
// Expected output: 6
console.log("foo" * 2);
// Expected output: NaN
構文
js
x * y;
例
数値を用いた乗算
js
2 * 2; // 4
-2 * 2; // -4
無限大との乗算
js
Infinity * 0; // NaN
Infinity * Infinity; // Infinity
非数との乗算
js
"foo" * 2; // NaN
仕様書
Specification |
---|
ECMAScript® 2025 Language Specification # sec-multiplicative-operators |
ブラウザーの互換性
Report problems with this compatibility data on GitHubdesktop | mobile | server | ||||||||||||
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Multiplication ( * ) |
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.