Js forEach traverses the array

The forEach () method is used to call each element of the array and pass the element to the callback function

Main usage scenario: traverse each element of the array

grammar

Traversal array. forEach (function (current array element, current element index number) {//function body})

        const arr=['red','green','blue']
        arr.forEach(function(item,index){
            console.log(item,index)
        })

be careful:

ForEach mainly traverses arrays

The current array element of the parameter must be written, and the index number is optional