问题描述
我刚刚通过最新的 Create-React-App 版本创建了一个新的 React 项目：
$ npx create-react-app my-app --template cra-template-pwa-typescript
不对生成的项目进行任何更改反应更改，我想使用“StaleWhileRevalidate”工作箱策略通过软件自动缓存所有“.data”和“.png”文件。
下面是软件配置。
./service-worker.ts
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';
declare const self: ServiceWorkerGlobalScope;
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('/[^/?]+\\.[^/]+$');
registerRoute(
// Return false to exempt requests from being fulfilled by index.html.
({ request,url }: { request: Request; url: URL }) => {
// If this isn't a navigation,skip.
if (request.mode !== 'navigate') {
return false;
}
// If this is a URL that starts with /_,skip.
if (url.pathname.startsWith('/_')) {
return false;
}
// If this looks like a URL for a resource,because it contains
// a file extension,skip.
if (url.pathname.match(fileExtensionRegexp)) {
return false;
}
// Return true to signal that we want to use the handler.
return true;
},createHandlerBoundToURL(process.env.PUBLIC_URL + '/index.html')
);
// An example runtime caching route for requests that aren't handled by the
// precache,in this case same-origin .png requests like those from in public/
registerRoute(
// Add in any other file extensions or routing criteria as needed.
//({ url }) => url.origin === self.location.origin && url.pathname.endsWith('.png'),({ url }) => url.pathname.endsWith('.png'),// <################# It doesn't work
// Customize this strategy as needed,e.g.,by changing to CacheFirst.
new StaleWhileRevalidate({
cacheName: 'images',plugins: [
// Ensure that once this runtime cache reaches a maximum size the
// least-recently used images are removed.
new ExpirationPlugin({ maxEntries: 50 }),],})
);
// This allows the web app to trigger skipwaiting via
// registration.waiting.postMessage({type: 'SKIP_WAITING'})
self.addEventListener('message',(event) => {
if (event.data && event.data.type === 'SKIP_WAITING') {
self.skipwaiting();
}
});
./serviceWorkerRegistration.ts（未做任何更改）
const isLocalhost = Boolean(
window.location.hostname === 'localhost' ||
// [::1] is the IPv6 localhost address.
window.location.hostname === '[::1]' ||
// 127.0.0.0/8 are considered localhost for IPv4.
window.location.hostname.match(/^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/)
);
type Config = {
onSuccess?: (registration: ServiceWorkerRegistration) => void;
onUpdate?: (registration: ServiceWorkerRegistration) => void;
};
export function register(config?: 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: string,config?: 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 and will be used when all ' +
'tabs for this page are closed. See https://cra.link/PWA.'
);
// 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: string,config?: 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);
});
}
}
我正在本地测试软件，例如：
$ yarn build
$ server build
问题：
非常感谢，
解决方法
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