Q:

setInterval: changing numbers in function depending on times that event has occured

I need to figure out how to use setInterval() to make text increase 1px(font-size) every 1000 ms.  Here's my setup:
    function boom() {
  var fwuff = document.getElementById("fwuff");
  fwuff.style.display="block";
  fwuff.style.textAlign="center"
  setInterval(function(){
    fwuff.style.fontSize=?? 
  }, 1000);
}

What I don't know is what to put in the fwuff.style.fontSize so I can get the size to increase every time the event occurs.  Does anyone understand and know how to do this? 

A:

Just use a variable : 
function boom() {
    var fwuff = document.getElementById("fwuff");
    var myAwesomeVar = 10; //Base font size
    fwuff.style.display="block";
    fwuff.style.textAlign="center"
    setInterval(function(){
        fwuff.style.fontSize= myAwesomeVar + "px";
        myAwesomeVar++;
    }, 1000);
}

