Javascript String basename()

/**/*  ww  w.ja va  2s  . c o  m*/
@Name: String.prototype.basename
@Author: Paul Visco
@Version: 1.0 11/19/07
@Description: Grabs the basename from a url
@Return: String The filename part of the original string
@Example:
var myString = 'http://www.google.com/logo.gif';
var newString = myString.basename();
//newString = 'logo.gif';

*/
String.prototype.basename = function(){
 var re = new RegExp("/\\/", "g");
 var str = this.replace(re, "/");
 var filename=str.split("/");
 return filename[(filename.length - 1)];
};

String.prototype.basename = function() {
  return this.replace(/^.*\//, '');
}

String.prototype.basename = function()
{
    return this.split('/').reverse()[0];
};