Service Worker 更新不起作用？

Question

我有一個由 nginx 托管的 Jekyll 站點。

我對我的站點進行了幾處更改，更新了包版本並更改了我的 javascript 以更新 Service Worker。 但是我的更改仍然沒有反映在 chrome 中；

主文件

if ('serviceWorker' in navigator) {
navigator.serviceWorker.register('/sw.js', {scope: 'sw-test'}).then(function(registration) {
// registration worked
console.log('Registration succeeded.');
    registration.update();
}).catch(function(error) {
// registration failed
console.log('Registration failed with ' + error)
 });
}

sw.js

var PRECACHE = 'precache-{{site.version}}';
var RUNTIME = 'runtime';

// A list of local resources we always want to be cached.
var PRECACHE_URLS = [
    './',
    '/index.html',
    '/assets/css/main.css',
    '/assets/js/vendor/modernizr-custom.js',
    '/assets/js/bundle.js'
];

// The install handler takes care of precaching the resources we always need.
self.addEventListener('install', event => {
  event.waitUntil(
    caches.open(PRECACHE)
      .then(cache => cache.addAll(PRECACHE_URLS))
      .then(self.skipWaiting())
  );
});

// The activate handler takes care of cleaning up old caches.
self.addEventListener('activate', event => {
  var currentCaches = [PRECACHE, RUNTIME];
  event.waitUntil(
    caches.keys().then(cacheNames => {
      return cacheNames.filter(cacheName => !currentCaches.includes(cacheName));
    }).then(cachesToDelete => {
      return Promise.all(cachesToDelete.map(cacheToDelete => {
        return caches.delete(cacheToDelete);
      }));
    }).then(() => self.clients.claim())
  );
});

// The fetch handler serves responses for same-origin resources from a cache.
// If no response is found, it populates the runtime cache with the response
// from the network before returning it to the page.
self.addEventListener('fetch', event => {
  // Skip cross-origin requests, like those for Google Analytics.
  if (event.request.url.startsWith(self.location.origin)) {
    event.respondWith(
      caches.match(event.request).then(cachedResponse => {
        if (cachedResponse) {
          return cachedResponse;
        }

        return caches.open(RUNTIME).then(cache => {
          return fetch(event.request).then(response => {
            // Put a copy of the response in the runtime cache.
            return cache.put(event.request, response.clone()).then(() => {
              return response;
            });
          });
        });
      })
    );
  }
});

Chrome 截圖Screenshot

非常感謝任何幫助！！

Answer 1

您的 nginx 配置很可能在 SW 腳本上設置了一些緩存標頭。 在這種情況下，瀏覽器會完全從其本地緩存跳過網絡返回舊版本。