javascript random effect on display the number

random-effect.html

<div id="random-area">1</div>

<script language="javascript">
var max_random = 100,
  random_area = document.getElementById("random-area"),
	origin_text = random_area.innerHTML;

function random(max_random) {
	var arr = "0123456789".split('');

	if (max_random < 0) {
		random_area.innerHTML = origin_text;
		return;
	}
	
	random_area.innerHTML = arr[Math.floor(Math.random()*arr.length)];
	
	setTimeout(function() {
		random(--max_random);
	}, 1000/25);
}

random(--max_random);
</script>