Ajax Basic Object

Ajax is stand for Asynchronous Javascript and XML.
The question is what kind of javascript’s object that has been use for making Ajax object ? as we know that outside, there is a lot of Ajax object that has been made. Like MagicAjax, Atlas, etc.
The answer is HttpObject in javascript. The existing HttpObject until now is XMLHttpRequest, “MSXML2.XMLHTTP” activeXobject, “Microsoft.XMLHTTP” activeXobject.

Example :

function GetHttpObject()
{
  var xmlhttp;
 
   if (window.XMLHttpRequest)
 {
  try{xmlhttp = new XMLHttpRequest();}
  catch (e){ xmlhttp = false;}
 }
 else if (window.ActiveXObject)
 {
  var clsids = ["MSXML2.XMLHTTP", "Microsoft.XMLHTTP"];
  for(var i=0; i<clsids.length; i++)
  {
   try{xmlhttp = new ActiveXObject(clsids[i]);break;}
   catch (e){xmlhttp = false;}
  }
 }
  return xmlhttp;
}