service-worker.js

self.addEventListener('install', function() {});
self.addEventListener('fetch', (event) => {
	/**@type {Request} */
	const request = event.request;
	// Let the browser do its default thing
	// for non-GET requests.
	if (request.method !== 'GET') return;
	if (request.url.includes('music.163.com')) return;
	// Prevent the default, and handle the request ourselves.
	event.respondWith(qwq(event));
});
async function qwq(event) {
	/**@type {Request} */
	const request = event.request;
	// Try to get the response from a cache.
	const cache = await caches.open('qwq');
	const cachedResponse = await cache.match(request);
	if (cachedResponse) {
		// If we found a match in the cache, return it, but also
		// update the entry in the cache in the background.
		event.waitUntil(cache.add(request).catch(() => {}));
		return cachedResponse;
	} else {
		// If we didn't find a match in the cache, use the network.
		const response = await fetch(request).catch(function() {
			return new Response('', { status: 521, statusText: 'Web Server Is Down' });
		});
		const reg = /unpkg|data|jsdelivr|baomitu|googleapis|loli|res\.phi\.zone/;
		if (response.ok && reg.test(request.url)) event.waitUntil(cache.put(request, response.clone()));
		return response;
	}
}