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;

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 GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
Multiplication (*)

Legend

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Full support
Full support

関連情報