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Does anyone know how to get the variable names in the array? For example, [a, b, c] wants to get the values of a, b, c and a, b, c respectively by traversing.
温故而知新，可以为师矣。 博客：www.ouyangke.com
> arr=[] > arr['a']=1 > arr['b']=2 > arr['c']=3 > for(k in arr)console.log(k,arr[k]) a 1 b 2 c 3 > arr [ a: 1, b: 2, c: 3 ]
No.
for in?
for in
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
No.
for in?