Example of WebWorker worker

worker.js

// This is our computation, we just initialise it for now.
var rt = new RayTracer(700, 700);

// we are in the worker.js thread so 'this' has the correct scope.
this.addEventListener('message', function(e) {
  
    // Start the work
    if (e.message === 'Start your work') {
        var result = rt.raytrace();
      
        // When we are done post the result
        this.postMessage(result);
    }

}, false);