具有索引位置的 For..in 循环数组迭代

Question

I tried looping over an array with for..in loop and show the index of each item but it showed an error message. Who has an idea of how this thing work?

Answer 1

For arrays you will need to use for...of rather than for...in which is for iterating over objects.

However, for...of will not give you the index - only the value .

Use forEach for this purpose:

array.forEach(function (value, index) {

});