Service Worker 离线回退与路由降级策略

`title: Service Worker 离线回退与路由降级策略``categories: Web 开发/前端/数据管理``keywords: Service Worker,离线回退,路由降级,占位,缓存``description: 为文档与接口设计离线回退与路由降级策略，提供占位与队列入库，保障用户体验与数据一致性。`文档回退self.addEventListener('fetch', (event) => { if (event.request.destination === 'document') { event.respondWith((async () => { try { return await fetch(event.request); } catch { return await caches.match('/offline.html'); } })()); } });