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js實現數組內數據的上移和下移

wapi [] ice down this 實現 div arr data

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)   } }

js實現數組內數據的上移和下移