我如何缓存其他路由以供离线浏览？

Question

我正在设置一个支持脱机浏览的渐进式Web应用程序。

我已经为我的主要路线（'domainsample.com/'）设置了脱机浏览，即使脱机也可以响应200。

但是当我导航到其他路线（'domainsample.com/about'）时，我收到No Internet Page错误。

这里是我在Heroku中部署的示例URL：https://pwa-hehe.herokuapp.com

[我使用Vue CLI 3设置了项目，并使用Node.js和Express.js在服务器中运行我的dist文件夹。

// server.js
const express = require('express')
const path = require('path')
const history = require('connect-history-api-fallback')

const app = express()

const staticFileMiddleware = express.static(path.join(__dirname + '/dist'))

app.use(staticFileMiddleware)

app.use(history({
    disableDotRule: true,
    verbose: true
}))

app.use(staticFileMiddleware)

app.get('/', function (req, res) {
    res.render(path.join(__dirname + '/dist/'))
})

var server = app.listen(process.env.PORT || 3000, function () {
    var port = server.address().port
    console.log("App now running on port", port)
})

// manifest.json
{
  "name": "pwa-offline",
  "short_name": "pwa-offline",
  "icons": [
    {
      "src": "./img/icons/android-chrome-192x192.png",
      "sizes": "192x192",
      "type": "image/png"
    },
    {
      "src": "./img/icons/android-chrome-512x512.png",
      "sizes": "512x512",
      "type": "image/png"
    }
  ],
  "start_url": "./index.html",
  "display": "standalone",
  "background_color": "#000000",
  "theme_color": "#4DBA87"
}

// service-worker.js

/**
 * Welcome to your Workbox-powered service worker!
 *
 * You'll need to register this file in your web app and you should
 * disable HTTP caching for this file too.
 * 
 *
 * The rest of the code is auto-generated. Please don't update this file
 * directly; instead, make changes to your Workbox build configuration
 * and re-run your build process.
 * 
 */

importScripts("https://storage.googleapis.com/workbox-cdn/releases/3.6.3/workbox-sw.js");

importScripts(
  "/precache-manifest.d3f1ce5d8331bddc555348f44cfba9d8.js"
);

workbox.core.setCacheNameDetails({prefix: "pwa-offline"});

/**
 * The workboxSW.precacheAndRoute() method efficiently caches and responds to
 * requests for URLs in the manifest.
 * 
 */
self.__precacheManifest = [].concat(self.__precacheManifest || []);
workbox.precaching.suppressWarnings();
workbox.precaching.precacheAndRoute(self.__precacheManifest, {});

Answer 1

问题是您的服务工作者不知道要缓存哪些资产。 self.__precacheManifest的值是多少？ （可能是网络清单文件）。

您需要配置工作箱才能为precacheAndRoute方法拥有一些资产，因为这将指示服务工作者在哪些文件上缓存缓存以及何时缓存。类似于：

workbox.precaching.precacheAndRoute([
  '/styles/example.ac29.css',
  '/app/offlinePage.js',
  '/app/offlinePage.html',
  // ... other entries ...
]);

默认情况下，服务工作者不知道要缓存哪些资产或HTTP响应，因此我们必须根据我们的要求定义和实施缓存策略。

我写了一篇有关service workers and the available caching strategies的文章。如果您想加深话题，请看一下。