无符号右移赋值 (>>>=)

let a = 5; //  00000000000000000000000000000101

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

let b = -5; // -00000000000000000000000000000101

b >>>= 2; //  00111111111111111111111111111110
console.log(b);
// Expected output: 1073741822

x >>>= y

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

let b = -5; // (-00000000000000000000000000000101)
b >>>= 2; // 1073741822 (00111111111111111111111111111110)

let c = 5n;
c >>>= 2n; // 1n