JS inserts the and deletion method at the specified position of the array

The splice () method adds/deletes items to/from the array and returns the deleted items.

Grammar

arrayObject.splice(index,howmany,item1,.....,itemX)

Parameter description

参数	描述
index	必需。整数，规定添加/删除项目的位置，使用负数可从数组结尾处规定位置。
howmany	必需。要删除的项目数量。如果设置为 0，则不会删除项目。
item1, …, itemX	可选。向数组添加的新项目。

Instances

Add 1 element

var array = [1,2,3,4,6];
array.splice(4,0,5);

Results: array was [1, 2, 3, 4, 5, 6].

Delete and replace 1 element

var array = [1,2,2,4,5];
array.splice(2,1,2);

Results: array was [1, 2, 3, 4, 5].