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Automatic conversion of JS data subscript

Tapuzi edited in Tue, 30 Nov 2021
var arr = [1,2,3,4,5,6,7]
for(var j in arr){

When j + 1 is output, j is automatically converted to string processing. The output J-1 is processed digitally. What is the reason?

2 Replies
commented on Tue, 30 Nov 2021

The variables in the for in loop are all strings (index), + can be used as a string connector, you can change it to console.log (+j+1);

commented on Wed, 01 Dec 2021

It's upstairs. In addition, array traversal with for in is not recommended. Develop the habit of writing standard code.

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