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右移赋值（>>=） - JavaScript | MDN

Baseline Widely available

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。

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

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

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

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