counter.js

$('[data-counter]').each(function(i, n) {
	runCounter($(n));
});

function runCounter($el) {
  var target = +$el.data('counter');
  var step   = +($el.data('step') || Math.floor(target / 711) + 2);
  
  var commas = ''+$el.data('commas') === 'false' ? false : true;
  var value  = 0;
  
  (function loop() {
    var n = commas ? addCommas(''+value) : value.toFixed(2);
    $el.text(n);
  	if (value < target) {
      value = Math.min(value + step, target);
    	setTimeout(loop);
    }
  })();
}


function addCommas(n) {
  var res = '';
  for (var i = n.length - 1, run = 0; i >= 0; i--) {
    if (run === 3) {
      res = ',' + res;
      run = 0;
    }
    res = n[i] + res;
    run++;
  }
  
  return res;
}