Mobile Offline - Service Worker Initialization

index(html)2.js

        //Listen for claiming of our ServiceWorker
        navigator.serviceWorker.addEventListener('controllerchange', function() {
          console.log( 'Service worker status changed: ', this.controller.state );
          // Listen for changes in the state of our ServiceWorker
          navigator.serviceWorker.controller.addEventListener('statechange', function() {
            // If the ServiceWorker becomes "activated", let the user know they can go offline!
            if (this.state === 'activated') {
                window.location.reload( true );
            }
          });
        });