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Web Workers

Using Web Workers in HTML5

Though the name seems pretty complex, these are nothing but the pieces of JavaScript that run in the background so that the webpage performance is not affected. So, simply we can say that web-workers are JavaScript code snippets that run behind the scenes without affecting the user experience on the client side or the browser.


<input type="button" onclick="sayHello();" value="Say Hello" />


var worker = new Worker('webworker.js');

worker.onmessage = function (event) {
  alert("Completed " + event.data + "iterations" );

function sayHello(){
  alert("Hello sir...." );



for (var i = 0; i <= 1000000000; i += 1){
  var j = i;

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