\u5728\u79fb\u52a8\u4f18\u5148\u7684\u65f6\u4ee3\uff0c\u7528\u6237\u671f\u671b\u5e94\u7528\u80fd\u50cf\u539f\u751f\u4e00\u6837\u5feb\u901f\u3001\u53ef\u9760\u3001\u53ef\u5b89\u88c5\u3002PWA\uff08\u6e10\u8fdb\u5f0f Web \u5e94\u7528\uff09\u901a\u8fc7 Service Worker \u8d4b\u4e88 Web \u5e94\u7528\u79bb\u7ebf\u80fd\u529b\u3001\u540e\u53f0\u540c\u6b65\u548c\u63a8\u9001\u901a\u77e5\uff0c\u800c\u65e0\u9700\u4e0a\u67b6\u5e94\u7528\u5546\u5e97\u3002<\/p>\n
\u4f46\u5f88\u591a\u5f00\u53d1\u8005\u5bf9 Service Worker \u7684\u7406\u89e3\u505c\u7559\u5728\u201c\u7f13\u5b58 HTML\u201d\u7684\u5c42\u9762\uff0c\u5b9e\u9645\u843d\u5730\u65f6\u4f1a\u9047\u5230\u7f13\u5b58\u66f4\u65b0\u4e0d\u53ca\u65f6\u3001\u63a8\u9001\u6743\u9650\u88ab\u62d2\u3001\u540e\u53f0\u540c\u6b65\u5931\u8d25\u7b49\u95ee\u9898\u3002\u672c\u6587\u5c06\u7528\u4e00\u4e2a\u53ef\u8fd0\u884c\u7684 Demo\uff08\u4e00\u4e2a\u7b80\u5355\u7684\u7b14\u8bb0\u5e94\u7528\uff09\u5e26\u4f60\u5b8c\u6574\u8d70\u4e00\u904d PWA \u7684\u5b9e\u73b0\u8def\u5f84\uff0c\u5e76\u5206\u4eab\u6211\u5728\u751f\u4ea7\u73af\u5883\u4e2d\u603b\u7ed3\u7684 7 \u4e2a\u6700\u4f73\u5b9e\u8df5\u3002<\/p>\n
\u6211\u4eec\u4f7f\u7528\u539f\u751f JavaScript + Vite \u6784\u5efa\uff0c\u907f\u514d\u6846\u67b6\u5e72\u6270\u3002\u5148\u521b\u5efa\u9879\u76ee\uff1a<\/p>\n
\nnpm create vite@latest pwa-notes -- --template vanilla\ncd pwa-notes\nnpm install\nnpm install workbox-window -D\n<\/code><\/pre>\n\u9879\u76ee\u7ed3\u6784\u5982\u4e0b\uff1a<\/p>\n
\npwa-notes\/\n\u251c\u2500\u2500 index.html\n\u251c\u2500\u2500 main.js\n\u251c\u2500\u2500 sw.js # Service Worker \u5165\u53e3\n\u251c\u2500\u2500 manifest.json # PWA \u6e05\u5355\u6587\u4ef6\n\u2514\u2500\u2500 icons\/ # \u5e94\u7528\u56fe\u6807\n<\/code><\/pre>\n\u7b2c\u4e00\u6b65\uff1a\u7f16\u5199 manifest.json \u8ba9\u5e94\u7528\u53ef\u5b89\u88c5<\/h2>\n
PWA \u53ef\u5b89\u88c5\u7684\u524d\u63d0\u662f\u63d0\u4f9b\u6709\u6548\u7684 manifest\u3002\u5728\u9879\u76ee\u6839\u76ee\u5f55\u521b\u5efa manifest.json<\/code>\uff1a<\/p>\n\n{\n "name": "PWA Notes",\n "short_name": "Notes",\n "start_url": "\/",\n "display": "standalone",\n "background_color": "#ffffff",\n "theme_color": "#4f46e5",\n "icons": [\n {\n "src": "\/icons\/icon-192.png",\n "sizes": "192x192",\n "type": "image\/png"\n },\n {\n "src": "\/icons\/icon-512.png",\n "sizes": "512x512",\n "type": "image\/png"\n }\n ]\n}\n<\/code><\/pre>\n\u5728 index.html<\/code> \u7684 <\/code> \u4e2d\u5f15\u5165\uff1a<\/p>\n\n<link rel="manifest" href="\/manifest.json" \/>\n<meta name="theme-color" content="#4f46e5" \/>\n<\/code><\/pre>\n\u6ce8\u610f<\/strong>\uff1astart_url<\/code> \u5fc5\u987b\u662f\u76f8\u5bf9\u8def\u5f84\u6216\u540c\u6e90\u8def\u5f84\uff0c\u5426\u5219\u5b89\u88c5\u63d0\u793a\u4e0d\u4f1a\u51fa\u73b0\u3002\u56fe\u6807\u81f3\u5c11\u63d0\u4f9b 192×192 \u548c 512×512 \u4e24\u4e2a\u5c3a\u5bf8\uff0cChrome \u624d\u4f1a\u89e6\u53d1\u5b89\u88c5\u6a2a\u5e45\u3002<\/p>\n\u7b2c\u4e8c\u6b65\uff1aService Worker \u751f\u547d\u5468\u671f\u4e0e\u6ce8\u518c<\/h2>\n
Service Worker \u7684\u751f\u547d\u5468\u671f\u662f\u7406\u89e3\u4e00\u5207\u7f13\u5b58\u884c\u4e3a\u7684\u57fa\u7840\u3002\u5b83\u7ecf\u5386 install<\/code> \u2192 waiting<\/code> \u2192 activate<\/code> \u2192 fetch<\/code> \u7b49\u9636\u6bb5\u3002\u5173\u952e\u70b9\uff1a\u65b0\u7684 SW \u4e0d\u4f1a\u7acb\u5373\u63a5\u7ba1\u9875\u9762\uff0c\u76f4\u5230\u6240\u6709\u65e7\u9875\u9762\u5173\u95ed\u3002<\/p>\n\u5728 main.js<\/code> \u4e2d\u6ce8\u518c\uff1a<\/p>\n\nif ('serviceWorker' in navigator) {\n window.addEventListener('load', async () => {\n try {\n const registration = await navigator.serviceWorker.register('\/sw.js', {\n scope: '\/'\n });\n console.log('SW \u6ce8\u518c\u6210\u529f\uff0c\u4f5c\u7528\u57df:', registration.scope);\n } catch (error) {\n console.error('SW \u6ce8\u518c\u5931\u8d25:', error);\n }\n });\n}\n<\/code><\/pre>\n\ud83d\udca1 \u6700\u4f73\u5b9e\u8df5<\/strong>\uff1a\u4e0d\u8981\u7528 navigator.serviceWorker.ready<\/code> \u6765\u7b49\u5f85\u6fc0\u6d3b\uff0c\u5b83\u6c38\u8fdc\u4e0d\u4f1a\u5728\u6ce8\u518c\u5931\u8d25\u65f6 resolve\u3002\u66f4\u597d\u7684\u505a\u6cd5\u662f\u76d1\u542c updatefound<\/code> \u4e8b\u4ef6\uff0c\u63d0\u793a\u7528\u6237\u5237\u65b0\u3002<\/p>\n\u7b2c\u4e09\u6b65\uff1a\u5b9e\u73b0\u79bb\u7ebf\u7f13\u5b58\u7b56\u7565<\/h2>\n
\u5728 sw.js<\/code> \u4e2d\uff0c\u6211\u4eec\u91c7\u7528 Stale-While-Revalidate<\/strong> \u7b56\u7565\uff1a\u4f18\u5148\u8fd4\u56de\u7f13\u5b58\uff0c\u540c\u65f6\u540e\u53f0\u66f4\u65b0\u7f13\u5b58\u3002\u8fd9\u662f\u5e73\u8861\u901f\u5ea6\u548c\u65b0\u9c9c\u5ea6\u7684\u6700\u4f73\u65b9\u6848\u3002<\/p>\n\nconst CACHE_NAME = 'pwa-notes-v1';\nconst PRECACHE_URLS = ['\/', '\/index.html', '\/main.js', '\/manifest.json'];\n\n\/\/ \u5b89\u88c5\u65f6\u9884\u7f13\u5b58\u6838\u5fc3\u8d44\u6e90\nself.addEventListener('install', (event) => {\n event.waitUntil(\n caches.open(CACHE_NAME).then((cache) => cache.addAll(PRECACHE_URLS))\n );\n self.skipWaiting(); \/\/ \u5f3a\u5236\u65b0 SW \u7acb\u5373\u6fc0\u6d3b\n});\n\n\/\/ \u6fc0\u6d3b\u65f6\u6e05\u7406\u65e7\u7f13\u5b58\nself.addEventListener('activate', (event) => {\n event.waitUntil(\n caches.keys().then((keys) =>\n Promise.all(\n keys.filter((key) => key !== CACHE_NAME).map((key) => caches.delete(key))\n )\n )\n );\n self.clients.claim(); \/\/ \u7acb\u5373\u63a5\u7ba1\u6240\u6709\u9875\u9762\n});\n\n\/\/ \u62e6\u622a\u8bf7\u6c42\nself.addEventListener('fetch', (event) => {\n const { request } = event;\n \/\/ \u53ea\u5904\u7406 GET \u8bf7\u6c42\n if (request.method !== 'GET') return;\n\n event.respondWith(\n caches.match(request).then((cached) => {\n const fetchPromise = fetch(request)\n .then((networkResponse) => {\n \/\/ \u53ea\u7f13\u5b58\u6210\u529f\u7684\u54cd\u5e94\n if (networkResponse && networkResponse.status === 200) {\n const responseClone = networkResponse.clone();\n caches.open(CACHE_NAME).then((cache) => {\n cache.put(request, responseClone);\n });\n }\n return networkResponse;\n })\n .catch(() => cached); \/\/ \u7f51\u7edc\u5931\u8d25\u65f6\u56de\u9000\u5230\u7f13\u5b58\n\n return cached || fetchPromise;\n })\n );\n});\n<\/code><\/pre>\n\u6ce8\u610f<\/strong>\uff1askipWaiting()<\/code> \u548c clients.claim()<\/code> \u867d\u7136\u65b9\u4fbf\uff0c\u4f46\u53ef\u80fd\u5bfc\u81f4\u65b0\u65e7\u7248\u672c\u8d44\u6e90\u6df7\u7528\u3002\u751f\u4ea7\u73af\u5883\u5efa\u8bae\u914d\u5408\u7248\u672c\u53f7\u63a7\u5236\uff0c\u6216\u4f7f\u7528 Workbox \u7684 GenerateSW<\/code> \u63d2\u4ef6\u81ea\u52a8\u5904\u7406\u3002<\/p>\n\u7b2c\u56db\u6b65\uff1a\u540e\u53f0\u540c\u6b65\uff08Background Sync\uff09<\/h2>\n
\u5f53\u7528\u6237\u79bb\u7ebf\u65f6\u63d0\u4ea4\u7b14\u8bb0\uff0c\u6211\u4eec\u5e0c\u671b\u7f51\u7edc\u6062\u590d\u540e\u81ea\u52a8\u91cd\u8bd5\u3002\u540e\u53f0\u540c\u6b65 API \u53ef\u4ee5\u505a\u5230\uff1a<\/p>\n
\n\/\/ main.js \u4e2d\u63d0\u4ea4\u8868\u5355\nasync function submitNote(note) {\n try {\n const response = await fetch('\/api\/notes', {\n method: 'POST',\n body: JSON.stringify(note),\n headers: { 'Content-Type': 'application\/json' }\n });\n if (!response.ok) throw new Error('\u63d0\u4ea4\u5931\u8d25');\n } catch (error) {\n \/\/ \u79bb\u7ebf\u6216\u5931\u8d25\uff0c\u6ce8\u518c\u540e\u53f0\u540c\u6b65\n const registration = await navigator.serviceWorker.ready;\n await registration.sync.register('sync-notes');\n \/\/ \u5c06\u6570\u636e\u5b58\u5165 IndexedDB \u4ee5\u4fbf\u540e\u7eed\u91cd\u8bd5\n await saveNoteToIndexedDB(note);\n }\n}\n<\/code><\/pre>\n\u5728 sw.js<\/code> \u4e2d\u76d1\u542c\u540c\u6b65\u4e8b\u4ef6\uff1a<\/p>\n\nself.addEventListener('sync', (event) => {\n if (event.tag === 'sync-notes') {\n event.waitUntil(retryPendingNotes());\n }\n});\n\nasync function retryPendingNotes() {\n const notes = await getPendingNotesFromIndexedDB();\n for (const note of notes) {\n try {\n await fetch('\/api\/notes', {\n method: 'POST',\n body: JSON.stringify(note),\n headers: { 'Content-Type': 'application\/json' }\n });\n await deleteNoteFromIndexedDB(note.id);\n } catch (error) {\n \/\/ \u4ecd\u7136\u5931\u8d25\uff0c\u7b49\u5f85\u4e0b\u6b21\u540c\u6b65\n throw error;\n }\n }\n}\n<\/code><\/pre>\n\ud83d\udca1 \u6700\u4f73\u5b9e\u8df5<\/strong>\uff1a\u540e\u53f0\u540c\u6b65\u53ea\u5728\u7528\u6237\u6709\u7f51\u7edc\u65f6\u89e6\u53d1\uff0c\u4f46 Chrome \u8981\u6c42\u9875\u9762\u5728\u540e\u53f0\u65f6\u624d\u80fd\u89e6\u53d1\u540c\u6b65\u3002\u6d4b\u8bd5\u65f6\u53ef\u4ee5\u901a\u8fc7 DevTools \u7684 Application \u2192 Background Services \u2192 Sync \u624b\u52a8\u89e6\u53d1\u3002<\/p>\n\u7b2c\u4e94\u6b65\uff1a\u6d88\u606f\u63a8\u9001\uff08Push API\uff09<\/h2>\n
\u63a8\u9001\u9700\u8981\u540e\u7aef\u914d\u5408\uff0c\u8fd9\u91cc\u6211\u4eec\u7528 Node.js \u6f14\u793a\u4e00\u4e2a\u6781\u7b80\u7684\u63a8\u9001\u670d\u52a1\u3002\u5148\u5728\u524d\u7aef\u8ba2\u9605\uff1a<\/p>\n
\n\/\/ main.js \u4e2d\u8bf7\u6c42\u901a\u77e5\u6743\u9650\u5e76\u8ba2\u9605\nasync function subscribePush() {\n const permission = await Notification.requestPermission();\n if (permission !== 'granted') return;\n\n const registration = await navigator.serviceWorker.ready;\n const subscription = await registration.pushManager.subscribe({\n userVisibleOnly: true,\n applicationServerKey: urlBase64ToUint8Array('YOUR_PUBLIC_VAPID_KEY')\n });\n\n \/\/ \u5c06 subscription \u53d1\u9001\u5230\u540e\u7aef\u4fdd\u5b58\n await fetch('\/api\/subscribe', {\n method: 'POST',\n body: JSON.stringify(subscription),\n headers: { 'Content-Type': 'application\/json' }\n });\n}\n\nfunction urlBase64ToUint8Array(base64String) {\n const padding = '='.repeat((4 - (base64String.length % 4)) % 4);\n const base64 = (base64String + padding).replace(\/-\/g, '+').replace(\/_\/g, '\/');\n const rawData = atob(base64);\n return Uint8Array.from([...rawData].map((char) => char.charCodeAt(0)));\n}\n<\/code><\/pre>\n\u5728 sw.js<\/code> \u4e2d\u5904\u7406\u63a8\u9001\u4e8b\u4ef6\uff1a<\/p>\n\nself.addEventListener('push', (event) => {\n const data = event.data ? event.data.json() : {};\n event.waitUntil(\n self.registration.showNotification(data.title || '\u65b0\u6d88\u606f', {\n body: data.body || '\u4f60\u6709\u4e00\u6761\u65b0\u901a\u77e5',\n icon: '\/icons\/icon-192.png',\n badge: '\/icons\/badge.png',\n data: { url: data.url || '\/' }\n })\n );\n});\n\nself.addEventListener('notificationclick', (event) => {\n event.notification.close();\n event.waitUntil(\n clients.openWindow(event.notification.data.url)\n );\n});\n<\/code><\/pre>\n\u6ce8\u610f<\/strong>\uff1aVAPID \u5bc6\u94a5\u5bf9\u5fc5\u987b\u901a\u8fc7 web-push<\/code> \u5e93\u751f\u6210\uff0c\u516c\u94a5\u5728\u524d\u7aef\u4f7f\u7528\uff0c\u79c1\u94a5\u5728\u540e\u7aef\u7b7e\u540d\u3002\u4e0d\u8981\u5c06\u79c1\u94a5\u66b4\u9732\u5728\u524d\u7aef\u4ee3\u7801\u4e2d\u3002<\/p>\n\u5e38\u89c1\u5751\u4e0e\u89e3\u51b3\u65b9\u6848<\/h2>\n1. \u7f13\u5b58\u4e86\u9519\u8bef\u7684\u54cd\u5e94<\/h3>\n
cache.put()<\/code> \u4f1a\u7f13\u5b58\u6240\u6709\u54cd\u5e94\uff0c\u5305\u62ec 404 \u548c 500\u3002\u52a1\u5fc5\u68c0\u67e5 response.status === 200<\/code> \u4e14 response.type === 'basic'<\/code>\uff08\u540c\u6e90\uff09\u3002<\/p>\n2. \u5f00\u53d1\u73af\u5883\u7f13\u5b58\u5bfc\u81f4\u70ed\u66f4\u65b0\u5931\u6548<\/h3>\n
\u5728\u5f00\u53d1\u73af\u5883\u4e2d\uff0c\u5efa\u8bae\u7981\u7528 Service Worker \u6216\u4f7f\u7528 network-first<\/code> \u7b56\u7565\u3002Vite \u9879\u76ee\u53ef\u4ee5\u901a\u8fc7\u73af\u5883\u53d8\u91cf\u5224\u65ad\uff1a<\/p>\n\nif (import.meta.env.DEV) {\n \/\/ \u5f00\u53d1\u73af\u5883\u4e0d\u6ce8\u518c SW\n} else {\n navigator.serviceWorker.register('\/sw.js');\n}\n<\/code><\/pre>\n3. \u63a8\u9001\u6743\u9650\u88ab\u62d2\u7edd\u540e\u65e0\u6cd5\u518d\u6b21\u8bf7\u6c42<\/h3>\n
\u4e00\u65e6\u7528\u6237\u62d2\u7edd\uff0cNotification.requestPermission()<\/code> \u4e0d\u4f1a\u518d\u5f39\u51fa\u3002\u5fc5\u987b\u5f15\u5bfc\u7528\u6237\u624b\u52a8\u5728\u6d4f\u89c8\u5668\u8bbe\u7f6e\u4e2d\u5f00\u542f\u3002<\/p>\n4. iOS Safari \u7684\u517c\u5bb9\u6027<\/h3>\n
iOS \u4ece 16.4 \u5f00\u59cb\u652f\u6301 Web Push\uff0c\u4f46\u8981\u6c42 PWA \u5fc5\u987b\u6dfb\u52a0\u5230\u4e3b\u5c4f\u5e55\u3002\u4e14\u4e0d\u652f\u6301 beforeinstallprompt<\/code> \u4e8b\u4ef6\uff0c\u9700\u8981\u624b\u52a8\u5f15\u5bfc\u7528\u6237\u901a\u8fc7\u5206\u4eab\u83dc\u5355\u5b89\u88c5\u3002<\/p>\n\u4f7f\u7528 Workbox \u7b80\u5316\u751f\u4ea7\u73af\u5883<\/h2>\n
\u624b\u52a8\u7ba1\u7406\u7f13\u5b58\u7248\u672c\u548c\u7b56\u7565\u5bb9\u6613\u51fa\u9519\uff0c\u63a8\u8350\u4f7f\u7528 Workbox\u3002\u5b89\u88c5\uff1a<\/p>\n
\nnpm install workbox-webpack-plugin -D\n<\/code><\/pre>\n\u5728 vite.config.js<\/code> \u4e2d\u914d\u7f6e\uff1a<\/p>\n\nimport { VitePWA } from 'vite-plugin-pwa';\n\nexport default {\n plugins: [\n VitePWA({\n registerType: 'autoUpdate',\n workbox: {\n globPatterns: ['**\/*.{js,css,html,png,svg}'],\n runtimeCaching: [\n {\n urlPattern: \/^https:\\\/\\\/api\\.example\\.com\\\/.*\/i,\n handler: 'NetworkFirst',\n options: {\n cacheName: 'api-cache',\n expiration: { maxEntries: 50, maxAgeSeconds: 86400 }\n }\n }\n ]\n }\n })\n ]\n};\n<\/code><\/pre>\nWorkbox \u4f1a\u81ea\u52a8\u751f\u6210 sw.js<\/code> \u5e76\u5904\u7406\u7248\u672c\u63a7\u5236\uff0c\u4f60\u53ea\u9700\u5173\u6ce8\u4e1a\u52a1\u903b\u8f91\u3002<\/p>\n\u603b\u7ed3\u4e0e\u4e0b\u4e00\u6b65<\/h2>\n
\u901a\u8fc7\u672c\u6587\uff0c\u4f60\u5b8c\u6210\u4e86\uff1a<\/p>\n
\n- \u914d\u7f6e manifest \u4f7f\u5e94\u7528\u53ef\u5b89\u88c5<\/li>\n
- \u5b9e\u73b0 Stale-While-Revalidate \u7f13\u5b58\u7b56\u7565<\/li>\n
- \u4f7f\u7528 Background Sync \u5904\u7406\u79bb\u7ebf\u63d0\u4ea4<\/li>\n
- \u96c6\u6210 Push API \u5b9e\u73b0\u6d88\u606f\u63a8\u9001<\/li>\n
- \u4e86\u89e3\u5e38\u89c1\u5751\u4e0e Workbox \u6700\u4f73\u5b9e\u8df5<\/li>\n<\/ul>\n
\u4e0b\u4e00\u6b65\u5efa\u8bae<\/strong>\uff1a<\/p>\n\n- \u5b66\u4e60 Workbox \u7684
BroadcastUpdatePlugin<\/code> \u5b9e\u73b0\u9875\u9762\u65e0\u5237\u65b0\u66f4\u65b0<\/li>\n- \u63a2\u7d22 Periodic Background Sync \u5b9e\u73b0\u5b9a\u65f6\u540c\u6b65<\/li>\n
- \u4f7f\u7528 Lighthouse \u5ba1\u8ba1 PWA \u5f97\u5206\uff0c\u4f18\u5316\u6027\u80fd\u6307\u6807<\/li>\n<\/ol>\n
PWA \u4e0d\u662f\u94f6\u5f39\uff0c\u4f46\u5b83\u662f\u76ee\u524d\u6700\u63a5\u8fd1\u539f\u751f\u4f53\u9a8c\u7684 Web \u65b9\u6848\u3002\u5e0c\u671b\u8fd9\u7bc7\u6307\u5357\u80fd\u5e2e\u4f60\u5c11\u8d70\u5f2f\u8def\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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