按位与赋值运算符（＆=）表示两个操作数的二进制，对它们进行按位AND运算并将结果分配给变量。
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语法
Operator: x &= y Meaning: x = x & y
例子
按位与赋值运算
let a = 5;
// 5: 00000000000000000000000000000101
// 2: 00000000000000000000000000000010
a &= 2; // 0规范
| Specification |
|---|
| ECMAScript (ECMA-262) Assignment operators |
浏览器兼容性
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