Collection of some array and string prototype object extensions to implement code _javascript tips

From the worry-free script collected, some really good, more practical, worth collecting.
methods to extend the prototype object of an array

Copy Code code as follows:

Delete data in an array
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");

methods to extend the prototype object of a string

Copy Code code as follows:

Get an array of characters
String.prototype.tochararray=function ()
{
Return This.split ("");
}
Get n the same string
String.prototype.repeat=function (num)
{
var tmparr=[];
for (Var i=0;i<num;i++) Tmparr.push (this);
Return Tmparr.join ("");
}
Reverse
String.prototype.reverse=function ()
{
Return This.split (""). Reverse (). Join ("");
}
Test whether it is a number
String.prototype.isnumeric=function ()
{
var tmpfloat=parsefloat (this);
if (isNaN (Tmpfloat)) return false;
var tmplen=this.length-tmpfloat.tostring (). length;
return tmpfloat+ "0". Repeat (Tmplen) ==this;
}
Test whether it is an integer
String.prototype.isint=function ()
{
if (this== "NaN") return false;
Return This==parseint (This). ToString ();
}
Merge multiple blanks into one blank
String.prototype.resetBlank = function ()
{
Return This.replace (/s+/g, "");
}
Remove left blank
String.prototype.LTrim = function ()
{
Return This.replace (/^s+/g, "");
}
Remove Right blank
String.prototype.RTrim = function ()
{
Return This.replace (/s+$/g, "");
}
Remove both sides of white space
String.prototype.trim = function ()
{
Return This.replace (/(^s+) | ( s+$)/g, "");
}
Keep numbers
String.prototype.getNum = function ()
{
Return This.replace (/[^d]/g, "");
}
Keep Letters
String.prototype.getEn = function ()
{
Return This.replace (/[^a-za-z]/g, "");
}
Keep Chinese
String.prototype.getCn = function ()
{
Return This.replace (/[^u4e00-u9fa5uf900-ufa2d]/g, "");
}
Get byte length
String.prototype.getRealLength = function ()
{
Return This.replace (/[^x00-xff]/g, "--"). Length;
}
To intercept a string of a specified length from the left
String.prototype.left = function (n)
{
Return This.slice (0,n);
}
To intercept a string of a specified length from the right
String.prototype.right = function (n)
{
Return This.slice (THIS.LENGTH-N);
}
HTML encoding
String.prototype.HTMLEncode = function ()
{
var re = this;
var q1 = [/x26/g,/x3c/g,/x3e/g,/x20/g];
var q2 = ["&", "<", ">", ""];
for (Var i=0;i<q1.length;i++)
Re = Re.replace (Q1[i],q2[i]);
return re;
}
Unicode conversion
String.prototype.ascW = function ()
{
var strText = "";
for (var i=0; i<this.length; i++) StrText + = "&#" + this.charcodeat (i) + ";";
return strText;
}