张不怂

正则版: ``` function format(num){ return String(num).replace(/(\d)(?=(\d{3})+(?!\d))/g,'$1,') } ```

遍历的同时,进行截取比较 ```javascript let str = 'fdsfsdzffdfdddfsdsds' let arr = [] const s = str.split('') let total= 0; // 长度 let maxStr = '' // 最长不重复长度的字符串 for(var i = 0;i -1){...

```javascript // 没有人比我的代码更短! function mySetInterVal(fn, a, b) { let timer= setTimeout(() => { fn() mySetInterVal(fn,a+b,b) }, a) return () => { clearTimeout(timer) } } const myClear =mySetInterVal(()=>{console.log('abc')},1000,500); // 清除定时器 myClear()...

```javascript function fn (n){ if(n==0) return 0 if(n==1) return 1 return fn(n-2)+fn(n-1) } const fn = (n)=>{ let pre = 1; let cur = 1; let data ; for(var i...