v1.4.8r Add service worker to cache the webpages, but i dont know if it works

skolehjem/public/js/serviceWorkerCachedWebpags.js

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+const staticCacheName = 'site-static-v2';
+const dynamicCacheName = 'site-dynamic-v1';
+const assets = [
+    '/',
+    '/css/app.css',
+    '/css/normalize.css',
+    '/css/webapp.css',
+    '/css/webappdark.css',
+    '/home',
+    '/events'
+];
+
+// install event
+self.addEventListener('install', evt => {
+    //console.log('service worker installed');
+    evt.waitUntil(
+        caches.open(staticCacheName).then((cache) => {
+            console.log('caching shell assets');
+            return cache.addAll(assets);
+        })
+    );
+});
+
+// activate event
+self.addEventListener('activate', evt => {
+    //console.log('service worker activated');
+    evt.waitUntil(
+        caches.keys().then(keys => {
+            //console.log(keys);
+            return Promise.all(keys
+                .filter(key => key !== staticCacheName && key !== dynamicCacheName)
+                .map(key => caches.delete(key))
+            );
+        })
+    );
+});
+
+// fetch event
+self.addEventListener('fetch', evt => {
+    //console.log('fetch event', evt);
+    evt.respondWith(
+        caches.match(evt.request).then(cacheRes => {
+            return cacheRes || fetch(evt.request).then(fetchRes => {
+                return caches.open(dynamicCacheName).then(cache => {
+                    cache.put(evt.request.url, fetchRes.clone()).then(r => {
+                        return fetchRes;
+                    });
+
+                })
+            });
+        })
+    );
+});
+
+
+//Push notification, this is more of a demo you can test in the dev tool
+self.addEventListener('push', evt => {
+    const title = "Test Notification";
+    const body = "Det her et en demo på hvordan en notification kan se ud! ";
+    const icon = "/icons/browserFavIcon.svg"
+    const tag = "simple-push-example-tag";
+    evt.waitUntil(
+      self.registration.showNotification(title, {
+          body : body,
+          icon : icon,
+          tag : tag
+      })
+    );
+});
+
+
+
+function displayNotification(){
+    if(Notification.permission === 'granted'){
+        navigator.serviceWorker.getRegistration()
+            .then(function (reg){
+                reg.showNotification('Helloe ')
+            })
+    }
+}
+

skolehjem/public/js/serviceWorkerRegistration.js

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+//Service Worker Registration
+
+/*
+Make sure that we support service worker :)
+ */
+
+if('serviceWorker' in navigator){
+    window.addEventListener('load', () => {
+        navigator.serviceWorker
+        .register('/js/serviceWorkerCachedWebpags.js')
+            .then(reg => console.log("Service Worker has been: registered"))
+            .catch(err => console.log(`Service Worker error: ${err}`))
+    })
+}
+
+/*
+
+Notification.requestPermission().then(function(permission){
+    console.log('Notification permission was:', permission)
+});
+
+
+if('caches' in window){
+    console.log("The browser supports caching ")
+}else {
+    console.log("This browser is some junk, it dosen't support caching :(")
+}
+*/