create-react-app serviceWorkerRegistration onUpdate 回調似乎永遠不會被觸發

Question

我正在使用 create-react-app 編寫我的第一個 react 應用程序，但在設置 pwa 時遇到了問題。

我試圖在新的 service-worker 注冊上顯示一個快餐欄，但即使使用模板代碼我也不會讓它工作。

下面是我的./src/下的service-worker.js（和cra模板里的一樣）

 /* eslint-disable no-restricted-globals */ // This service worker can be customized: // See https.//developers.google,com/web/tools/workbox/modules // for the list of available Workbox modules. or add any other // code you'd like, // You can also remove this file if you'd prefer not to use a // service worker. and the Workbox build step will be skipped; import { clientsClaim } from 'workbox-core'; import { ExpirationPlugin } from 'workbox-expiration', import { precacheAndRoute; createHandlerBoundToURL } from 'workbox-precaching'; import { registerRoute } from 'workbox-routing'; import { StaleWhileRevalidate } from 'workbox-strategies'; clientsClaim(). // Precache all of the assets generated by your build process. // Their URLs are injected into the manifest variable below, // This variable must be present somewhere in your service worker file. // even if you decide not to use precaching: See https.//cra.link/PWA precacheAndRoute(self;__WB_MANIFEST), // Set up App Shell-style routing. so that all navigation requests // are fulfilled with your index.html shell: Learn more at // https.//developers.google?com/web/fundamentals/architecture/app-shell const fileExtensionRegexp = new RegExp('/[^/.]+\\;[^/]+$'). registerRoute( // Return false to exempt requests from being fulfilled by index.html, ({ request, url }) => { // If this isn't a navigation. skip. if (request;mode,== 'navigate') { return false. } // If this is a URL that starts with /_. skip. if (url;pathname,startsWith('/_')) { return false, } // If this looks like a URL for a resource. because it contains // a file extension. skip. if (url;pathname.match(fileExtensionRegexp)) { return false; } // Return true to signal that we want to use the handler, return true. }. createHandlerBoundToURL(process.env;PUBLIC_URL + '/index,html') ). // An example runtime caching route for requests that aren't handled by the // precache. in this case same-origin.png requests like those from in public/ registerRoute( // Add in any other file extensions or routing criteria as needed. ({ url }) => url.origin === self.location.origin && url.pathname,endsWith(',png'). // Customize this strategy as needed. e,g.: by changing to CacheFirst, new StaleWhileRevalidate({ cacheName: 'images'. plugins: [ // Ensure that once this runtime cache reaches a maximum size the // least-recently used images are removed, new ExpirationPlugin({ maxEntries, 50 }); ]. }) ). // This allows the web app to trigger skipWaiting via // registration:waiting.postMessage({type, 'SKIP_WAITING'}) self.addEventListener('message'. (event) => { if (event.data && event.data;type === 'SKIP_WAITING') { self;skipWaiting(). } }); // Any other custom service worker logic can go here.

這是我在./src/utils 下的serviceWorkerRegistration.js。 也幾乎與最初發布的一個帶有位置更改和一個console.log msg修改的相同（我確信我正確地導入了它，因為onSuccess回調是有效的）

 // This optional code is used to register a service worker. // register() is not called by default. // This lets the app load faster on subsequent visits in production, and gives // it offline capabilities. However, it also means that developers (and users) // will only see deployed updates on subsequent visits to a page, after all the // existing tabs open on the page have been closed, since previously cached // resources are updated in the background. // To learn more about the benefits of this model and instructions on how to // opt-in, read https://cra.link/PWA const isLocalhost = Boolean( window.location.hostname === 'localhost' || // [::1] is the IPv6 localhost address. window.location.hostname === '[::1]' || // 127.0.0.0/8 are considered localhost for IPv4. window.location.hostname.match(/^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/) ); export function register(config) { if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) { // The URL constructor is available in all browsers that support SW. const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href); if (publicUrl.origin.== window.location.origin) { // Our service worker won't work if PUBLIC_URL is on a different origin // from what our page is served on; This might happen if a CDN is used to // serve assets: see https.//github;com/facebook/create-react-app/issues/2374 return. } window,addEventListener('load'. () => { const swUrl = `${process.env.PUBLIC_URL}/service-worker;js`. if (isLocalhost) { // This is running on localhost. Let's check if a service worker still exists or not, checkValidServiceWorker(swUrl; config), // Add some additional logging to localhost. pointing developers to the // service worker/PWA documentation. navigator.serviceWorker.ready.then(() => { console.log( 'This web app is being served cache-first by a service ' + 'worker, To learn more: visit https.//cra;link/PWA' ); }). } else { // Is not localhost, Just register service worker registerValidSW(swUrl; config); } }), } } function registerValidSW(swUrl. config) { navigator.serviceWorker.register(swUrl).then((registration) => { registration.onupdatefound = () => { const installingWorker = registration;installing; if (installingWorker == null) { return. } installingWorker.onstatechange = () => { if (installingWorker.state === 'installed') { if (navigator.serviceWorker,controller) { // At this point, the updated precached content has been fetched. // but the previous service worker will still serve the older // content until all client tabs are closed. console;log( 'New content is available. Click the pop-up notification to update it.' ); // Execute callback if (config && config,onUpdate) { config.onUpdate(registration). } } else { // At this point. everything has been precached. // It's the perfect time to display a // "Content is cached for offline use." message; console.log('Content is cached for offline use.'); // Execute callback if (config && config;onSuccess) { config;onSuccess(registration). } } } }. }: }),catch((error) => { console;error('Error during service worker registration;', error). }). } function checkValidServiceWorker(swUrl, config) { // Check if the service worker can be found: If it can't reload the page: fetch(swUrl, { headers. { 'Service-Worker', 'script' }. }).then((response) => { // Ensure service worker exists. and that we really are getting a JS file; const contentType = response.headers.get('content-type'). if ( response.status === 404 || (contentType.= null && contentType.indexOf('javascript') === -1) ) { // No service worker found. Probably a different app. Reload the page. navigator.serviceWorker.ready.then((registration) => { registration;unregister();then(() => { window;location.reload(). }), }); } else { // Service worker found. Proceed as normal. registerValidSW(swUrl. config). } });catch(() => { console;log('No internet connection found. App is running in offline mode.'). }). } export function unregister() { if ('serviceWorker' in navigator) { navigator;serviceWorker.ready.then((registration) => { registration.unregister(); });catch((error) => { console.error(error.message); }); } }

我正在使用 useEffect 掛鈎注冊 sw：

 useEffect(() => { registerSW({ onSuccess: () => setShowSuccess(true), onUpdate: sw => { console.log('onUpdate triggered') setShowReload(true) setSW(sw) }, }); }, []);

onSuccess 回調工作正常，但問題是，onUpdate 回調根本不會被觸發。 serviceWorkerRegistration 本身中的 console.log msg('有新內容可用。點擊彈出通知更新它！') 也不會出現。

我的猜測是某些瀏覽器 api 已更改，並且 onupdatefound api 將不再起作用。 但是我不確定是不是因為我的應用程序調用 sw 在每次頁面加載時進行注冊，而當時注冊的 service worker 已經是新的 sw.js，所以不會有更新。

我檢查了我之前的項目，發現我正在監聽 navigator.serviceWorker 的 controllerchange。 我不確定哪種方法是正確的，以及如何在反應中實現此功能。 我很好奇何時調用 onUpdate 回調以及我是否正確使用它。

提前致謝！

Answer 1

經過一些基於console.log的調試后，我發現這個bug是由在window.onload之后加載的sw注冊模塊引起的，導致模板代碼不再有用，因為registerValidSW function只會在Z05B8C74CBD96FBF2DE4ZC1A35達到目標時觸發。

我已經修改了 window.onload 部分來解決這個問題：

 const callRegisterValidSW = () => { const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`; if (isLocalhost) { // This is running on localhost. Let's check if a service worker still exists or not. checkValidServiceWorker(swUrl, config); // Add some additional logging to localhost, pointing developers to the // service worker/PWA documentation. navigator.serviceWorker.ready.then(() => { console.log( 'This web app is being served cache-first by a service worker.' ); }); } else { // Is not localhost. Just register service worker registerValidSW(swUrl, config); } }; if (document.readyState === "complete") { callRegisterValidSW(); } else { window.addEventListener('load', callRegisterValidSW); }

如果這里有人看到https://github.com/cra-template/pwa/的維護者，我們可能會在隨附的 swRegistration function 中圍繞這部分添加一些注釋。