wei xiong
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wei xiong
> ```js > function test(num){ > num = typeof num === 'number' ? num.toString() : num > if(num.length else return num[num.length - 1] + test(num.substring(0, num.length - 1)) > }...
@atheist1 DFSdeepClone中通过if（～index）判断引用类型是否clone过不妥，直接判断index > -1不更好吗