右移赋值(>>=)

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.

右移赋值运算符(>>=)将变量向右移动指定的位数,并将结果赋值给变量。

尝试一下

let a = 5; //  00000000000000000000000000000101

a >>= 2; //  00000000000000000000000000000001
console.log(a);
// Expected output: 1

let b = -5; //  11111111111111111111111111111011

b >>= 2; //  11111111111111111111111111111110
console.log(b);
// Expected output: -2

语法

js
x >>= y // x = x >> y

示例

使用右移赋值

js
let a = 5; //   (00000000000000000000000000000101)
a >>= 2; // 1 (00000000000000000000000000000001)

let b = -5; //  (-00000000000000000000000000000101)
b >>= 2; // -2 (-00000000000000000000000000000010)

规范

Specification
ECMAScript® 2025 Language Specification
# sec-assignment-operators

浏览器兼容性

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
Right shift assignment (x >>= y)

Legend

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Full support
Full support

参考