相乘運算子（*）
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.
相乘運算子（*）是用來取得兩個運算元的乘積。
嘗試一下
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
語法
js
x * y
範例
乘以數字
js
2 * 2; // 4
-2 * 2; // -4
乘以無限（Infinity）
js
Infinity * 0; // NaN
Infinity * Infinity; // Infinity
乘以非數字
js
"foo" * 2; // NaN
規範
| Specification |
|---|
| ECMAScript® 2025 Language Specification # sec-multiplicative-operators |
瀏覽器相容性
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