Copy Code code as follows:
<script>
Array.prototype.pop=function () {
if (this.length!=0) this.length--;
return this;
}
Pop method
Moves the last element in the divisor group and returns the element.
Arrayobj.pop ()
The required arrayobj reference is an Array object.
Description
If the array is empty, then the undefined is returned.
Copy Code code as follows:
var a=[1,2,3,4]
A.pop ()
Alert (a)
Alert (A.pop ()) </script><script>
Push Method
Adds a new element to an array and returns the new length value of the array.
Arrayobj.push ([Item1 [item2 [...] [Itemn]]])
Parameters
Arrayobj
Required option. An Array object.
Item, Item2,... itemn
Options available. The new element of the Array.
Description
The push method adds these elements in the order in which the new elements appear. If one of the arguments is an array, the array is added as a single element to the arrays. If you want to merge elements from two or more arrays, use the Concat method.
Copy Code code as follows:
Array.prototype.push=function () {
var len=arguments.length;
if (len>0) for (Var i=0;i<len;i++) this[this.length]=arguments[i];
return this.length;
}
var a=[1,2,3,4]
A.push (5)
Alert (a)
Alert (A.push (6)) </script><script>
Unshift Method
Inserts the specified element into the starting position of the array and returns the array.
Arrayobj.unshift ([item1[, item2 [, ...] [, Itemn]]]
Parameters
Arrayobj
Required option. An Array object.
Item1, item2,.. ., itemn
Options available. The element that will be inserted at the beginning of the Array.
Description
The Unshift method inserts these elements into the beginning of an array, so these elements appear in the order in the sequence of arguments in the array.
Copy Code code as follows:
Array.prototype.unshift=function () {
var len=arguments.length;
This.reverse ();
if (len>0) for (Var i=len;i>0;i--) this[this.length]=arguments[i-1];
return This.reverse ();
}
var a=[1,2,3,4]
A.unshift ()
Alert (a)
A.unshift (5,6)
Alert (a)
Alert (A.unshift (7)) </script><script language= "JScript" >
Array.prototype.splice=function () {
var len=arguments.length;
var tarray=[];
if (len>1) {
for (Var i=arguments[0]+arguments[1];i<this.length;i++) tarray[tarray.length]=this[i];
This.length=arguments[0];
if (len>2) for (Var i=2;i<len;i++) this[this.length]=arguments[i];
var tlen=tarray.length;
for (Var i=0;i<tlen;i++) this[this.length]=tarray[i];
}
return this;
}
var a=[1,2,3,4];
Splice Method
Removes one or more elements from an array and, if necessary, inserts a new element at the position of the removed element, returning the removed element.
Arrayobj.splice (Start, DeleteCount, [item1[, item2[, ...) [, Itemn]]]
Parameters
Arrayobj
Required option. An Array object.
Start
Required option. Specifies that the starting position of the element is removed from the array, which is calculated starting at 0.
DeleteCount
Required option. The number of elements to remove.
Item1, item2,.. ., itemn
Required option. The new element to insert at the location of the removed element.
Description
The splice method modifies arrayobj by removing the specified number of elements starting from the start position and inserting new elements. The return value is a new Array object that consists of the removed element.
Copy Code code as follows:
Alert (A.splice (0,1));
Alert (A.splice (0,1,1,1,1,1,1,1,1))
</script><script>
Array.prototype.shift=function () {
var f=this[0];
for (Var i=0;i<this.length;i++) this[i]=this[i+1];
this.length--;
return F;
}
Shift Method
Moves the first element in the divisor group and returns the element.
Arrayobj.shift ()
The required arrayobj reference is an Array object.
Description
The shift method moves the first element in the divisor group and returns the element.
Copy Code code as follows:
var a=[1,2]
Alert (A.shift ())
Alert (a)
</script>
