Javascript String encode()

String.prototype.encode = function()
{
 return encodeURIComponent(this);
}

///*  w w  w. j av  a2s.com*/
// base64.js
// Copyright (C) 2009 David J. Goehrig
// All Rights Reserved
//
String.prototype.encstr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
String.prototype.enc = function() {
 var i = 0;
 var out = "";
 while ( i < this.length) {
  var c = [ this.charCodeAt(i), this.charCodeAt(i+1), this.charCodeAt(i+2) ];
  // alert(c);
  out += this.encstr.charAt(c[0]>>2) + 
   this.encstr.charAt(((c[0]&3)<<4) | ( i+1 < this.length ? (c[1]>> 4) : 0))  +
   this.encstr.charAt(i+1 < this.length ? ((c[1] & 15) <<2) | (c[2] >> 6): 64) +
   this.encstr.charAt(i+2 < this.length ? c[2] & 63 : 64);
  i+= 3;
 }
 return out;
};

String.prototype.pack = function(n) {
 var x = parseInt(n);
 return this + String.fromCharCode(x & 255) + String.fromCharCode((x >> 8) & 255) +
  String.fromCharCode((x >> 16) & 255) + String.fromCharCode((x >> 24) & 255);
};