ajax has got memory leak?

ajax tutorial on w3school at http://www.w3schools.com/ajax/ajax_database.asp

In this function (function GetXmlHttpObject()), it creates a object:

 new XMLHttpRequest(); or new ActiveXObject("Microsoft.XMLHTTP");

but it doesn't delete this object after getting respons from se开发者_如何学运维rver.

Are there memory leaks ?

It's ok - Garbage Collection will pick it up for you.

The garbage collector will take care of it once it is no longer referenced.