右移赋值 (>>=)

右移赋值 (>>=) 运算符对两个操作数执行 右移 并将结果赋给左操作数。

¥The right shift assignment (>>=) operator performs right shift on the two operands and assigns the result to the left operand.

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语法

¥Syntax

js
x >>= y

描述

¥Description

x >>= y 与 x = x >> y 等效，只是表达式 x 仅计算一次。

¥x >>= y is equivalent to x = x >> y, except that the expression x is only evaluated once.

示例

¥Examples

使用右移赋值

¥Using right shift assignment

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

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

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

规范

Specification
ECMAScript Language Specification
# sec-assignment-operators

¥Specifications

浏览器兼容性

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¥Browser compatibility

也可以看看

¥See also