Experience the power of splice () in js (insert, delete, or replace array elements)

There are many ways to process arrays. javascript splice () is the most powerful. It can be used to insert, delete, or replace array elements. Here is a one-to-one introduction!

1. Delete-used to delete an element. There are two parameters: the first parameter (the location of the first item to be deleted) and the second parameter (number of items to be deleted)
2. Insert-insert any element to the specified position of the array. Three parameters: the first parameter (actual location), the second parameter (0), and the third parameter (inserted item)
3. replace-insert any element to the specified position of the array, and delete any number of items, three parameters. The first parameter (start position), the second parameter (number of deleted items), and the third parameter (insert any number of items)

You can see the following code. Copy codeThe Code is as follows: var lang = ["php", "java", "javascript"];
// Delete
Var removed = lang. splice (1, 1 );
Alert (lang); // php, javascript
Alert (removed); // java, return the deleted item
// Insert
Var insert = lang. splice (0th, "asp"); // insert data from locations
Alert (insert); // returns an empty array
Alert (lang); // asp, php, javascript
// Replace
Var replace = lang. splice (, "c #", "ruby"); // delete one item and insert two items
Alert (lang); // asp, c #, ruby
Alert (replace); // php, return the deleted item