Edit in JSFiddle

var iii = 0;
//t is unqiue representer of this timer. 
//the callback is executed every 1000ms
var t = setInterval(function(){ 
    var element = document.getElementById("box");
    element.innerHTML = iii++;
    
    if(iii == 100)
    {
        clearInterval(t);//stops the timer
    }
}, 1000);//1000ms is the execution delay

<div id="box"></div>