https://coin.dance/sw.js

1var CACHE_NAME = 'coin-dance-cache-v1';
2var urlsToCache = [
3	'/'
4];
5
6// Set the callback for the install step
7self.addEventListener('install', function(event) {
8	// Perform install steps
9	event.waitUntil(
10		caches.open(CACHE_NAME)
11		.then(function(cache) {
12			console.log('Opened cache');
13			return cache.addAll(urlsToCache);
14		})
15	);
16});
17
18self.addEventListener('fetch', function(event) {
19  event.respondWith(
20    caches.match(event.request)
21      .then(function(response) {
22        // Cache hit - return response
23        if (response) {
24          return response;
25        }
26
27        return fetch(event.request);
28      }
29    )
30  );
31});
32
33self.addEventListener('activate', function(event) {
34
35  var cacheWhitelist = [];
36
37  event.waitUntil(
38    caches.keys().then(function(cacheNames) {
39      return Promise.all(
40        cacheNames.map(function(cacheName) {
41          if (cacheWhitelist.indexOf(cacheName) === -1) {
42            return caches.delete(cacheName);
43          }
44        })
45      );
46    })
47  );
48});