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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 2015年7月.
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。
In this article
尝试一下
let a = 5; // 00000000000000000000000000000101a &= 3; // 00000000000000000000000000000011console.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: 00000000000000000000000000000010a &= 2; // 0规范
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| ECMAScript® 2026 Language Specification> # sec-assignment-operators> |