To begin with, I'm a noob to JavaScript. How do I add functionality to the main loop, or something similar?

I'm trying to find a way to add functionality to Java Script's main event loop, from which the all its events are evaluated.

For example,

//every event based application has something similar at heart,
//usually, somewhere in the main function
while(application.isRunning()) 
{
 //process all events
 AbstractEvent **a = eventStack.begin()-1;
 while(++a!=eventStack.end())
 {
  application.processEvent(*a); //could be an "onclick","onmouseenter", exit, etc...
  //for Java Script, can I make stuff happen here
 }

 //or here?
}
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