Javascript: Call a function after specific time period

You can use JavaScript Timing Events to call function after certain interval of time:

This shows the alert box every 3 seconds:

setInterval(function(){alert("Hello")},3000);

You can use two method of time event in javascript.i.e.

1. setInterval(): executes a function, over and over again, at
   specified time intervals
2. setTimeout() : executes a function, once, after waiting a
   specified number of milliseconds