取余赋值（%=） - JavaScript | MDN
取余赋值（%=）
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.
取余赋值（%=）运算符将变量除以右操作数的值，并将余数赋值给该变量。
尝试一下
let a = 3;
console.log((a %= 2));
// Expected output: 1
console.log((a %= 0));
// Expected output: NaN
console.log((a %= "hello"));
// Expected output: NaN
语法
示例
使用取余赋值
js
let bar = 5;
bar %= 2; // 1
bar %= "foo"; // NaN
bar %= 0; // NaN
规范
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-assignment-operators |