Timing scripts in Javascript

Timing Events: Scripts can be scheduled to run via the following four commands:

1. Scheduling an event to be executed once in the future:
   

   var t_id = setTimeout ("script", milliseconds);

   
   
2. Canceling a scheduled event:
   

   clearTimeout (t_id)

   
   
3. Scheduling an event to be executed continuously at regular intervals in the future:
   

   var t_id = setInterval ("script", milliseconds);

   
   
4. Canceling an event scheduled in #3 above:
   

   clearInterval (t_id)

   
   

Example: Following code increments a counter after every one second:

<div id="counter">
</div>

<script>
    var count=0;
    setInterval (function () {
        count++;
        document.getElementById ("counter").innerHTML = "Counter value: " + count;    
    }, 1000);
</script>