Update helloworld-pwa.html

Author: Cube-J

1.hello-world/10.read-video-pwa/helloworld-pwa.html

@@ -30,7 +30,21 @@ <h1 style="font-size: 1.5em;">Hello World for PWA</h1>
 
         let pScanner = null;
         let latestResult = null;
-        window.onload = async function() {
+        
+        function startNotificationLoop() {
+            if (latestResult != null) {
+                const title = "New Barcode Found!";
+                const notifBody = `Barcode Text: ${latestResult}.`;
+                const options = {
+                    body: notifBody,
+                };
+                new Notification(title, options);
+                latestResult = null;
+            }
+            setTimeout(startNotificationLoop, 100);
+        }
+        
+        (async function() {
             Notification.requestPermission().then((result) => {
                 if (result === 'granted') {
                     startNotificationLoop();
@@ -52,24 +66,12 @@ <h1 style="font-size: 1.5em;">Hello World for PWA</h1>
                 alert(ex.message);
                 throw ex;
             }
-        };
-
-        function startNotificationLoop() {
-            if (latestResult != null) {
-                const title = "New Barcode Found!";
-                const notifBody = `Barcode Text: ${latestResult}.`;
-                const options = {
-                    body: notifBody,
-                };
-                new Notification(title, options);
-                latestResult = null;
-            }
-            setTimeout(startNotificationLoop, 100);
-        }
+        })();
+        
         if ('serviceWorker' in navigator) {
             navigator.serviceWorker.register('./service-worker.js');
         };
     </script>
 </body>
 
-</html>
+</html>