S.F.

``` function reserve(num) { let str = num.toString(); let len = str.length let first = str[len - 1] if (str.length > 1) { return first + reserve(str.substring(0, len-1)) } else...

比较粗暴 ``` continuity('1,2,3,5,7,8,10,11,12,13,15') function continuity(str) { let arr = str.split(',') let result = '' let start = arr[0] let last = '' add(0,1) function add(num1,num2) { if (Number(arr[num1]) + 1...

和一楼大佬思路一样 ``` var entry = { 'a.b.c.dd': 'abcdd', 'a.d.xx': 'adxx', 'a.e': 'ae', 'b.e':'cc', } doSth(entry) function doSth(obj){ let output = {} for (const key in obj) { console.log(key,obj[key]); let arr...

记录一下简单做的 ``` let objc = { a: 1, b: Symbol('2'), c:{ d: Symbol('3'), e: { f: Symbol('4'), } } }; function deepClone(obj) { let result = {} for (const key...