var c=0
var t
$foo = $('#foo')
function timedCount()
{
  $foo.html(c)
  c=c+1
  $foo.addClass('big')
  $foo.on('transitionend', function (e){
    var style = getComputedStyle(e.target)

    }
  }, 500)
  
}
$('#btn').on('click',function(){
  timedCount()
})