How to move elements up and down in a Javascript array

Preface
We can move elements up and down by exchanging arrays. We will use this effect in tables or previous sorting algorithms. Let’s look at an example of exchanging array elements and moving them up and down in JavaScript.
When writing a project, we need to implement an example of moving up and down array records. It's not troublesome to write, it's nothing more than exchanging array elements. The final implementation code is as follows, the more important thing is that function.
Sample code:

// 交换数组元素
  var swapItems = function(arr, index1, index2) {
    arr[index1] = arr.splice(index2, 1, arr[index1])[0];
    return arr;
  };
   
  // 上移
  $scope.upRecord = function(arr, $index) {
    if($index == 0) {
      return;
    }
    swapItems(arr, $index, $index - 1);
  };
   
  // 下移
  $scope.downRecord = function(arr, $index) {
    if($index == arr.length -1) {
      return;
    }
    swapItems(arr, $index, $index + 1);
  };

Using that method reasonably can achieve top and bottom implementations.

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