按位或赋值（|=）
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.
按位或赋值（|=) 运算符使用两个操作数的二进制表示，对它们执行按位或运算并将结果分配给变量。
尝试一下
let a = 5; // 00000000000000000000000000000101
a |= 3; // 00000000000000000000000000000011
console.log(a); // 00000000000000000000000000000111
// Expected output: 7
语法
js
x |= y // x = x | y
示例
使用按位或赋值
js
let a = 5;
a |= 2; // 7
// 5: 00000000000000000000000000000101
// 2: 00000000000000000000000000000010
// -----------------------------------
// 7: 00000000000000000000000000000111
规范
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-assignment-operators |