i++ 先赋值 后自增
++i 先自增,后赋值
```
let i = 0
console.log(i++) 0
console.log(i) 1
let j = 0;
console.log(++j) 1
console.log(j) 1
```
```
let i = 0
console.log(i++) 0
console.log(i) 1
let j = 0;
console.log(++j) 1
console.log(j) 1
```
本文标题:i++ ++i
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