Use Javascript to move up and down elements in an array

This article describes how to move up and down elements in an array using Javascript. The sample code in this article is very detailed and has some reference and learning value for everyone, let's take a look. This article describes how to move up and down elements in an array using Javascript. The sample code in this article is very detailed and has some reference and learning value for everyone, let's take a look.

Preface

We can change the array to move the elements up and down. This effect is used in tables or previous sorting algorithms. Here is an example of how to move the elements up and down in the exchange array in JavaScript.

When writing a project, you need to implement an example of moving up and down Array records. There is no trouble in writing it. It is nothing more than exchanging array elements. The final implementation code is as follows. What is more important is the function.

Sample Code:

// Exchange array element 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 );};

By using this method properly, you can achieve top-level and bottom-level implementations.

The preceding section describes how to use Javascript to move up and down elements in an array. For more information, see other related articles in the first PHP community!