renderer.html

<script src="renderer.js"></script>

renderer.js

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

worker.addEventListener('message', function (event) {

  var message = event.data;

  
  console.log( message );
  

}, false);

//  Send an object message to the worker
worker.postMessage({
  "renderer-process": "Hello Worker Process, I'm an object"
});


//  Send a string
worker.postMessage("Hello Worker Process, I'm a string");

worker.js

self.addEventListener('message', function (event) {
  var message = event.data;
  
  
  this.postMessage({
    
    "worker-process" : "I got it!", 
    "received:" : message
  
  });


}, false);