zengkaiz

```javascript // 打印20 var b = 10; (()=>{ b = 20 console.log(b) })() // 打印20 var b = 10; (function b(b){ b = 20; console.log(b); })(); // 打印20 var b...

```javascript let i = 0 Object.defineProperty('window', 'a', { get:()=>{ return ++i } } ```

// 方法1 ```javascript for (var i = 0; i< 10; i++){ (function fn(i){ setTimeout(() => { console.log(i); }, 1000) })(i) } ``` // 方法2 ``` for (var i = 0;...

> console.log(...[0,1,2,3,4,5,6,7,8,9]) are you dou 我？

```javascript function convert(list, parentId){ let tree = [] let temp for(let i=0; i0){ temp.children = obj } tree.push(obj) } } return tree } ```