How to clear a object from memory using JavaScript

Question

Possible Duplicate:
Deleting Objects in JavaScript

This is the demo code:

function a(){
    this.a='aaa'
}
var aa=new a

How to clear the aa object from the memory?

Answer 1

I may be wrong but I think setting the variable to null should do the trick.

Answer 2

set aa = null, alert(aa)!