js implements moving up and down of data in an array

This article mainly brings you an example of js realizing moving up and down data in an array. The editor thinks it is quite good, so I will share it with you now and give it as a reference for everyone. Let’s follow the editor to take a look, I hope it can help everyone.

The example is as follows:

var swapItems = function(arr, index1, index2){
　　arr[index1] = arr.splice(index2,1,arr[index1])[0]
　　return arr
}
var arr = [1,2,3]
var newArr = []
upData (arr, index) {
　　if (this.arr.length > 1 && index !== 0) {
　　　　newArr = swapItems(arr, index, index - 1)
　　}
}
downData (arr, index) {
　　if (this.arr.length > 1 && index !== (this.arr.length - 1)) {
　　　　newArr = swapItems(this.arr, index, index + 1)
　　}
}

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