The example of moving up and down of the exchange array elements under JavaScript

When writing a project, you implement an example of an array record moving up and down. There is no trouble writing, nothing more than swapping array elements. The final implementation code such as

, the more important thing is the function.

Swapping array elements
var swapitems = function (arr, index1, Index2) {
ARR[INDEX1] = Arr.splice (index2, 1, arr[index1]) [0];
return arr;
};

Move Up
$scope. Uprecord = function (arr, $index) {
if ($index = = 0) {
Return
}
Swapitems (arr, $index, $index-1);
};

Move Down
$scope. Downrecord = function (arr, $index) {
if ($index = = arr.length-1) {
Return
}
Swapitems (arr, $index, $index + 1);
};

Reasonable use of that method, you can achieve the top and bottom of some implementations.