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Question

我正在使用 service worker 构建一个 angular 9 PWA。我遵循了官方指南来增强 service worker 并且一切正常，直到今天，当我注意到我的应用程序不再具有 sw 功能（缓存、可安装性等）

灯塔状态：

Does not register a service worker that controls page and start_url

事实是，我没有触及它的任何东西，所以我无法弄清楚哪里出了问题。

ngsw.json:

{
  "$schema": "./node_modules/@angular/service-worker/config/schema.json",
  "index": "/index.html",
  "assetGroups": [
    {
      "name": "app",
      "installMode": "prefetch",
      "resources": {
        "files": [
          "/favicon.ico",
          "/index.html",
          "/manifest.webmanifest",
          "/*.css",
          "/*.js"
        ]
      }
    }, 
    {
      "name": "assets",
      "installMode": "lazy",
      "updateMode": "prefetch",
      "resources": {
        "files": [
          "/assets/**",
          "/*.(eot|svg|cur|jpg|png|webp|gif|otf|ttf|woff|woff2|ani)"
        ]
      }
    }
  ],
  "dataGroups": [
    {
      "name": "configs",
      "urls": [
        "active-profile",
        "configurations"
      ],
      "cacheConfig": {
        "maxSize": 1,
        "maxAge": "2d",
        "strategy": "performance"
      }
    },
    {
      "name": "searches",
      "urls": [
        "search"
      ],
      "cacheConfig": {
        "maxSize": 1,
        "maxAge": "15m",
        "strategy": "performance"
      }
    }
  ]
}

这里是清单：

{
  "name": "Shootbook",
  "short_name": "Shootbook",
  "theme_color": "#fafafa",
  "background_color": "#fff",
  "display": "standalone",
  "scope": "/",
  "start_url": "/",
  "icons": [
    {
      "src": "assets/icons/icon-72x72.png",
      "sizes": "72x72",
      "type": "image/png",
      "purpose": "any maskable"
    },
    {
      "src": "assets/icons/icon-96x96.png",
      "sizes": "96x96",
      "type": "image/png",
      "purpose": "any maskable"
    },
    {
      "src": "assets/icons/icon-128x128.png",
      "sizes": "128x128",
      "type": "image/png",
      "purpose": "any maskable"
    },
    {
      "src": "assets/icons/icon-144x144.png",
      "sizes": "144x144",
      "type": "image/png",
      "purpose": "any maskable"
    },
    {
      "src": "assets/icons/icon-152x152.png",
      "sizes": "152x152",
      "type": "image/png",
      "purpose": "any maskable"
    },
    {
      "src": "assets/icons/icon-192x192.png",
      "sizes": "192x192",
      "type": "image/png",
      "purpose": "any maskable"
    },
    {
      "src": "assets/icons/icon-384x384.png",
      "sizes": "384x384",
      "type": "image/png",
      "purpose": "any maskable"
    },
    {
      "src": "assets/icons/icon-512x512.png",
      "sizes": "512x512",
      "type": "image/png",
      "purpose": "any maskable"
    }
  ]
}

有什么想法吗？

Answer 1

我找到了解决方案：似乎 Angular 等待应用程序“稳定”（无论这意味着什么......）。要覆盖此行为，只需将 registrationStrategy 设置为 'registerImmediately':

ServiceWorkerModule.register('ngsw-worker.js', {
  enabled: environment.production,
  registrationStrategy: 'registerImmediately',
})

未检测到服务人员

Service worker not detected

angular

service-worker

angular-service-worker