Copy Code code as follows:
Array.prototype.arrayinsertafter=function (Num,obj)
{
var temparr=new Array ();
var l=this.length;
for (Var i=0;i<l;i++)
{
Temparr.push (This.shift ());
}
L=temparr.length;
for (Var i=0;i<l;i++)
{
This.push (Temparr.shift ());
if (i==num)
{
This.push (obj);
}
}
return this;
}
JavaScript Splice () Method Usage Description
Definitions and usage
The splice () method inserts, deletes, or replaces the elements of an array.
Grammar
Arrayobject.splice (index,howmany,element1,....., elementx)
| Parameters |
Description |
| Index |
Necessary. Specify where to add/remove elements from. This parameter is the subscript for the array element that starts inserting and/or deleting, and must be a number. |
| Howmany |
Necessary. Specify how many elements should be deleted. Must be a number, but it can be "0". If this parameter is not specified, all elements that start from index to the end of the original array are deleted. |
| Element1 |
Optional. Specify the new element to add to the array. Start the insertion at the lower mark that is indicated by index. |
| Elementx |
Optional. You can add several elements to an array. |
return value
If an element is removed from the Arrayobject, an array containing the deleted elements is returned.
description
The splice () method deletes 0 or more elements starting at index, and replaces the deleted elements with one or more values declared in the argument list.
Tips and Comments
Note: Notice that the splice () method is different from the slice () method, and the splice () method is modified directly to the array.
instance
Example 1
In this case, we'll create a new array and add an element to it:
<script type= "Text/javascript" > var arr = new Array (6) arr[0] = "George" arr[1] = "John" arr[2] = "Thomas" arr[ 3] = "James" arr[4] = "Adrew" arr[5] = "Martin" document.write (arr + "<br>") Arr.splice (2,0, "William") document . Write (arr + "<br>") </script>
[Ctrl + A All SELECT Note: If the need to introduce external JS need to refresh to perform]
Output:
George,john,thomas,james,adrew,martin
George,john,william,thomas,james,adrew,martin
Example 2
In this example we will delete the element at index 2 and add a new element to replace the deleted element:
<script type= "Text/javascript" > var arr = new Array (6) arr[0] = "George" arr[1] = "John" arr[2] = "Thomas" arr[ 3] = "James" arr[4] = "Adrew" arr[5] = "Martin" document.write (arr + "<br>") Arr.splice (2,1, "William") document . Write (arr) </script>
[Ctrl + A All SELECT Note: If the need to introduce external JS need to refresh to perform]
Output:
George,john,thomas,james,adrew,martin
George,john,william,james,adrew,martin
Example 3
In this example we will delete the three elements starting with index 2 ("Thomas") and add a new element ("William") to replace the deleted element:
<script type= "Text/javascript" > var arr = new Array (6) arr[0] = "George" arr[1] = "John" arr[2] = "Thomas" arr[ 3] = "James" arr[4] = "Adrew" arr[5] = "Martin" document.write (arr + "<br>") arr.splice (2,3, "William") document . Write (arr) </script>
[Ctrl + A All SELECT Note: If the need to introduce external JS need to refresh to perform]
Output:
George,john,thomas,james,adrew,martin
George,john,william,martin
