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按位或赋值（|=） - JavaScript | MDN

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按位或赋值（|=) 运算符使用两个操作数的二进制表示，对它们执行按位或运算并将结果分配给变量。

let a = 5; // 00000000000000000000000000000101
a |= 3; // 00000000000000000000000000000011

console.log(a); // 00000000000000000000000000000111
// Expected output: 7

let a = 5;
a |= 2; // 7
// 5: 00000000000000000000000000000101
// 2: 00000000000000000000000000000010
// -----------------------------------
// 7: 00000000000000000000000000000111

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