how to display first 20 numbers in a certain period of time in javascript code example

Example 1: javascript run something after x seconds

setTimeout(function(){
  location.reload();
}, 3000); //run this after 3 seconds

Example 2: setinterval vs settimeout js

var intervalID = setInterval(alert, 1000); // Will alert every second.
// clearInterval(intervalID); // Will clear the timer.

setTimeout(alert, 1000); // Will alert once, after a second.
setInterval(function(){ 
	console.log("Oooo Yeaaa!");
}, 2000);//run this thang every 2 seconds