是否可以手动添加到服务工作缓存?

Cache Storage API ServiceWorkerGlobalScope exposed window.caches web worker

Cache-Control Response fetch The Offline Cookbook

here's a fetch handler fetch()

self.addEventListener('fetch', function(event) {
  event.respondWith(
    fetch(event.request).catch(function() {
      return caches.match(event.request);
    })
  );
});