按位与赋值（&=）
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
按位与赋值运算符（&=）使用两个操作数的二进制表示，对它们进行按位与运算并将结果赋值给变量。
尝试一下
let a = 5; // 00000000000000000000000000000101
a &= 3; // 00000000000000000000000000000011
console.log(a); // 00000000000000000000000000000001
// Expected output: 1
语法
js
x &= y // x = x & y
示例
使用按位与赋值
js
let a = 5;
// 5: 00000000000000000000000000000101
// 2: 00000000000000000000000000000010
a &= 2; // 0
规范
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-assignment-operators |