JavascriptString extension method set _ javascript skills

String extension method set, which can be javascript's string function more // get character array
String. prototype. ToCharArray = function ()
{
Return this. split ("");
}
// Obtain N identical strings
String. prototype. Repeat = function (num)
{
Var tmpArr = [];
For (var I = 0; I Return tmpArr. join ("");
}
// Reverse Order
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 the value 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 the left blank
String. prototype. LTrim = function ()
{
Return this. replace (/^ s +/g ,"");
}
// Remove the right Blank
String. prototype. RTrim = function ()
{
Return this. replace (/s + $/g ,"");
}
// Remove the blank spaces on both sides
String. prototype. trim = function ()
{
Return this. replace (/(^ s +) | (s + $)/g ,"");
}
// Retain numbers
String. prototype. getNum = function ()
{
Return this. replace (/[^ d]/g ,"");
}
// Retain letters
String. prototype. getEn = function ()
{
Return this. replace (/[^ A-Za-z]/g ,"");
}
// Retain Chinese Characters
String. prototype. getCn = function ()
{
Return this. replace (/[^ u4e00-u9fa5uf900-ufa2d]/g ,"");
}
// Get the byte length
String. prototype. getRealLength = function ()
{
Return this. replace (/[^ x00-xff]/g, "--"). length;
}
// Extract a string of the specified length from the left
String. prototype. left = function (n)
{
Return this. slice (0, n );
}
// Extract a string of the 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 Re = re. replace (q1 [I], q2 [I]);
Return re;
}
// Unicode Conversion
String. prototype. ascW = function ()
{
Var strText = "";
For (var I = 0; I Return strText;
}