何鸣明

```javascript str.trim() ```

* ES6 ```javasscript let [a,b] = [b,a] ``` * ES5 ```javascript var a = 1,b = 2; a = b+a; b = a-b; a = a-b; ```

* 一维 ```javascript new set(...arr) ``` * 二维 ```javascript arr.reduce((a,b)=>{ return new set(...a.concat(b)) },[]) ```

```javascript function mixi(arr){ arr.sort(function(a,b){ (Math,random()>0.5)?a-b>0:a-b

* 容易理解是 JSON.parse JSON.stringify * 递归 ```javascript // 深度遍历 // 广度遍历 ```

* 字面量 ```javascript let obj = {} ``` * new 实例化 ```javascript let obj = new Object ``` * Object.create ```javascript let obj = Object.create({}) ```

怎么开始全是正则？？？？@haizhilin2013

```javascript fucntion repeat(str,parentStr){ return parentStr.split(str).length - 1 } ```

```javascript function cheackstr(str){ var reversestr=str.split("").reverse().join(""); if(str===reversestr){ alert("我是回文字符串"); }else{ alert("我不是回文字符串") } } ```

```javascript function calc (val) { return val === 1 ? 0 : 1 } let str = "0101" // => str = "1010" function change(str){ return ~str } ``` 这个问题不清楚考察什么...