Scheduling the Execution of Functions Using Timers

1433419040.js

var oneSecond = 1000 * 1; // one second = 1000 x 1 ms 

// setTimeout
setTimeout(function() {    
  document.write('<p>Hello there.</p>');
}, oneSecond);

// setInterval
var setInteval(function(){
  document.write('<p>Hello there.</p>');
}, oneSecond);

// using setTimeout to defer the execution of a function
var timeout = setTimeout(function(){
  console.log("Time out !");
}, oneSecond);

// using clearTimeout to cancel the execution of a function
clearTimeout(timeout);

// using setInterval to defer te repetitive of a function
var interval = setInterval(function(){
  console.log("tick !");
}, 1000);

// using clearInterval to cancel the repetitive of a function
clearInterval(timeout);