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sw.js
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sw.js
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const cacheName = 'news';
const staticAssets = [
'./',
'./app.js',
'./styles.css',
'./fallback.json',
];
self.addEventListener('install', async function () {
const cache = await caches.open(cacheName);
cache.addAll(staticAssets);
});
self.addEventListener('activate', event => {
event.waitUntil(self.clients.claim());
});
self.addEventListener('fetch', event => {
const request = event.request;
const url = new URL(request.url);
if (url.origin === location.origin) {
event.respondWith(cacheFirst(request));
} else {
event.respondWith(networkFirst(request));
}
});
async function cacheFirst(request) {
const cachedResponse = await caches.match(request);
return cachedResponse || fetch(request);
}
async function networkFirst(request) {
const dynamicCache = await caches.open('news-dynamic');
try {
const networkResponse = await fetch(request);
dynamicCache.put(request, networkResponse.clone());
return networkResponse;
} catch (err) {
const cachedResponse = await dynamicCache.match(request);
return cachedResponse || await caches.match('./fallback.json');
}
}