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[Java教程]js实现数组内数据的上移和下移

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)  }}