相除運算子（/）
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2015年7月.
相除運算子（/）是用來將兩個值進行相除並取得其商數。其中左運算元是被除數；右運算元是除數。
嘗試一下
console.log(12 / 2);
// Expected output: 6
console.log(3 / 2);
// Expected output: 1.5
console.log(6 / "3");
// Expected output: 2
console.log(2 / 0);
// Expected output: Infinity
語法
js
x / y
範例
基本的除法
js
1 / 2; // 0.5
Math.floor(3 / 2); // 1
1.0 / 2.0; // 0.5
除以零
js
2.0 / 0; // Infinity
2.0 / 0.0; // Infinity, because 0.0 === 0
2.0 / -0.0; // -Infinity
規範
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-multiplicative-operators |