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