乘法（*）
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2015年7月.
乘法（*）运算符计算操作数的乘积。
尝试一下
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
语法
js
x * y
示例
数值乘法
js
2 * 2; // 4
-2 * 2; // -4
与 Infinity 相乘
js
Infinity * 0; // NaN
Infinity * Infinity; // Infinity
非数值乘法
js
"foo" * 2; // NaN
规范
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-multiplicative-operators |