假定
let a = 1,b=10;期望交换a和b的值
| 序号 | 实现方案 | 中间变量? | 备注 |
|---|---|---|---|
| 1 | let c; c = a; a = b; b = c; |
✅ | |
| 2 | a ^= b; b ^=a; a ^=b |
MDN-按位操作符, 只适用Number类型 | |
| 3 | a = a + b; b = a - b; a = a - b; |
只适用Number类型 | |
| 4 | a = { a, b }; a = a.b; b = a.a |
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| 5 | a = [a, b]; b = a[0]; a = a[1] |
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| 6 | a = [b, b=a][0] |
有脑洞, b=a先执行 | |
| 7 | {a, b} = {a:b, b:a} |
对象解构赋值 | |
| 8 | [a, b] = [b, a] |
推荐, 数组解构赋值 |
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