Example of moving data up and down in an array using js

The following editor will bring you an example of js implementation of moving up and down data in an array. The editor thinks it’s pretty good, so I’ll share the js source code with you now and give it as a reference. If you are interested in js, please follow the editor to take a look.

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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