function main()
{
  alert(gettime(wait_loop1000));
}

function gettime(fun)
{
  var timediff;
  setTimeout(function()
  {
    var before = performance.now();
    fun();
    var after = performance.now();
    timediff = after-before;
  },0);
  return timediff;
}

function wait_loop1000()
{
  var testint = new Uint8Array([0]);
  for (var i = 0; i < 1000; i++){testint[0] = testint[0] + 1}
}


function wait_loop(a)
{
  var testint = new Uint8Array([0]);
  for (var i = 0; i < a; i++){testint[0] = testint[0] + 1}
}