A JavaScript String extension method collection _javascript Tips

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;
}