JavaScript array extension implements code collection _javascript tips

Array.prototype.del = function (n)
{
if (n<0) return this;
Return This.slice (0,n). Concat (This.slice (n+1,this.length));
}
Array Shuffle
Array.prototype.random = function ()
{
var nr=[], me=this, t;
while (me.length>0)
{
Nr[nr.length] = Me[t = Math.floor (Math.random () * me.length)];
me = Me.del (t);
}
return nr;
}
Sorting numeric arrays
Array.prototype.sortNum = function (f)
{
if (!f) f=0;
if (f==1) return This.sort (function (a,b) {return b-a;});
Return This.sort (function (a,b) {return a-b;});
}
Get the largest item in a numeric array
Array.prototype.getMax = function ()
{
return This.sortnum (1) [0];
}
Get the smallest item of a numeric array
Array.prototype.getMin = function ()
{
Return This.sortnum (0) [0];
}
The first occurrence of an array where the specified element value occurs
Array.prototype.indexOf = function (o)
{
For (Var i=0. i<this.length; i++) if (this[i]==o) return i;
return-1;
}
To move a duplicate item in a divisor group
Array.prototype.removerepeat=function ()
{
This.sort ();
var rs = [];
var cr = false;
for (var i=0; i<this.length; i++)
{
if (!CR) CR = This[i];
else if (Cr==this[i]) rs[rs.length] = i;
else CR = This[i];
}
var re = this;
for (var i=rs.length-1 i>=0; i--) re = Re.del (rs[i));
return re;
}

Example:
var arr=["ni", "Wo", "ta"];
Delete the "Wo" in the array
var newarr=arr.del (1);
Returns the position of the first occurrence of "me" in the array, if not, returns-1
var strpos=arr.indexof ("Me");