service-worker_offiline.js

const STATIC_DATA = [
  
  'index.html',
  'model/museum.glb',
  'babylonjs_js/babylon.js',
  'babylonjs_js/babylonjs.loaders.min.js',
  'babylonjs_js/babylonjs.material.min.js',
  'babylonjs_js/babylon.gui.min.js',
  'babylonjs_js/babylon.inspector.bundle.js',
  'babylonjs_js/pep.js',
  'js/TeleportCheck.js'
];

const cacheName ='cache_v1';

self.addEventListener('install', e => {
    console.log('[ServiceWorker] Install');
    e.waitUntil(
      caches.open(cacheName).then(cache => {
        return cache.addAll(STATIC_DATA)
        .then(()=> self.skipWaiting());
      })
    );
});
  
self.addEventListener('activate', e => {
  console.log('[ServiceWorker] Activate');
  e.waitUntil(self.clients.claim());
});
self.addEventListener('fetch', (e) => {
  e.respondWith(
    caches.match(e.request).then((r) => {
          console.log('[Service Worker] Fetching resource: '+e.request.url);
      return r || fetch(e.request).then((response) => {
                return caches.open(cacheName).then((cache) => {
          console.log('[Service Worker] Caching new resource: '+e.request.url);
          cache.put(e.request, response.clone());
          return response;
        });
      });
    })
  );
});