qinnn
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comments of
qinnn
```js var b = 10; (function b(){ var b = 20; console.log(this.b); console.log(b); })(); ```
```javascript var arr = [1,[2,3,[4,5]],8] function flatten(arr) { return arr.toString().split(",") } flatten(arr) ["1", "2", "3", "4", "5", "8"] ``` 这样呢？