我的 Vue 应用程序中有以下服务 worker 代码:

ma​​in.js

if (navigator.serviceWorker) {
  navigator.serviceWorker.register('/service-worker.js').catch(function() {
    console.log('Service worker registration failed.');
  });
}

service-worker.js

let currCacheName = 'premium-poker-tools-5';

self.addEventListener('install', function(event) {
  event.waitUntil(
    caches.open(currCacheName).then(function(cache) {
      let promise = cache.addAll([
        '/',
        'app.js',
        'c7d016677eb7e912bc40.worker.js',
        'f328c7e2b379df12fa4c.worker.js',
        'static/logo.png',
        'static/favicon.png',
        'static/loading.svg',
        'static/cards/ace-of-clubs.png',
        'static/cards/king-of-clubs.png',
        'static/cards/queen-of-clubs.png',
        'static/cards/jack-of-clubs.png',
        'static/cards/ten-of-clubs.png',
        'static/cards/nine-of-clubs.png',
        'static/cards/eight-of-clubs.png',
        'static/cards/seven-of-clubs.png',
        'static/cards/six-of-clubs.png',
        'static/cards/five-of-clubs.png',
        'static/cards/four-of-clubs.png',
        'static/cards/three-of-clubs.png',
        'static/cards/two-of-clubs.png',
        'static/cards/ace-of-spades.png',
        'static/cards/king-of-spades.png',
        'static/cards/queen-of-spades.png',
        'static/cards/jack-of-spades.png',
        'static/cards/ten-of-spades.png',
        'static/cards/nine-of-spades.png',
        'static/cards/eight-of-spades.png',
        'static/cards/seven-of-spades.png',
        'static/cards/six-of-spades.png',
        'static/cards/five-of-spades.png',
        'static/cards/four-of-spades.png',
        'static/cards/three-of-spades.png',
        'static/cards/two-of-spades.png',
        'static/cards/ace-of-hearts.png',
        'static/cards/king-of-hearts.png',
        'static/cards/queen-of-hearts.png',
        'static/cards/jack-of-hearts.png',
        'static/cards/ten-of-hearts.png',
        'static/cards/nine-of-hearts.png',
        'static/cards/eight-of-hearts.png',
        'static/cards/seven-of-hearts.png',
        'static/cards/six-of-hearts.png',
        'static/cards/five-of-hearts.png',
        'static/cards/four-of-hearts.png',
        'static/cards/three-of-hearts.png',
        'static/cards/two-of-hearts.png',
        'static/cards/ace-of-diamonds.png',
        'static/cards/king-of-diamonds.png',
        'static/cards/queen-of-diamonds.png',
        'static/cards/jack-of-diamonds.png',
        'static/cards/ten-of-diamonds.png',
        'static/cards/nine-of-diamonds.png',
        'static/cards/eight-of-diamonds.png',
        'static/cards/seven-of-diamonds.png',
        'static/cards/six-of-diamonds.png',
        'static/cards/five-of-diamonds.png',
        'static/cards/four-of-diamonds.png',
        'static/cards/three-of-diamonds.png',
        'static/cards/two-of-diamonds.png',
        'static/feedback/1.png',
        'static/feedback/2.png',
        'static/feedback/3.png',
        'static/feedback/4.png',
        'static/feedback/flop-selector.png',
        'static/feedback/green-grid-squares.png',
        'static/feedback/user-set-range-to-simulate-to-street.png',
        'static/guides/beginners-guide/1.png',
        'static/guides/beginners-guide/2.png',
        'static/guides/beginners-guide/3.png',
        'static/guides/beginners-guide/4.png',
        'static/guides/beginners-guide/5.png',
        'static/guides/beginners-guide/6.png',
        'static/guides/beginners-guide/7.png',
        'static/guides/beginners-guide/8.png',
        'static/guides/beginners-guide/9.png',
        'static/guides/beginners-guide/10.png',
        'static/guides/beginners-guide/11.png',
        'static/guides/beginners-guide/12.png',
        'static/guides/beginners-guide/13.png',
        'static/guides/beginners-guide/14.png',
        'static/guides/beginners-guide/15.png',
        'static/guides/beginners-guide/16.png',
        'static/guides/beginners-guide/17.png',
        'static/guides/beginners-guide/18.png',
        'static/guides/beginners-guide/19.png',
        'static/guides/beginners-guide/20.png',
        'static/guides/beginners-guide/21.png',
        'static/guides/faq/double-counting/1.png',
        'static/guides/faq/hit-percentage-calculation/1.png',
        'static/guides/faq/hit-percentage-calculation/2.png',
        'static/guides/faq/hit-percentage-calculation/3.png',
        'static/guides/faq/insights/1.png',
        'static/guides/faq/insights/2.png',
        'static/guides/faq/insights/3.png',
        'static/guides/faq/insights/4.png',
        'static/guides/faq/insights/5.png',
        'static/guides/faq/insights/6.png',
        'static/guides/faq/insights/7.png',
        'static/guides/faq/insights/8.png',
        'static/guides/faq/set-checks-to-default/1.png',
        'static/guides/quick-guide/1.png',
        'static/guides/quick-guide/2.png',
        'static/guides/quick-guide/3.png',
        'static/guides/quick-guide/4.png',
        'static/guides/quick-guide/5.png',
        'static/guides/quick-guide/6.png',
        'static/guides/quick-guide/7.png',
        'static/guides/quick-guide/8.png',
        'static/guides/quick-guide/save-load-scenario.png',
        'static/home/1.png',
        'static/home/2.png',
        'static/home/3.png',
        'static/settings/equity-calculator-insights-not-visible.png',
        'static/settings/equity-calculator-insights-visible.png',
        'static/settings/outcome-analyzer-checkboxes-collapsed-1.png',
        'static/settings/outcome-analyzer-checkboxes-collapsed-2.png',
        'static/settings/outcome-analyzer-checkboxes-included-1.png',
        'static/settings/outcome-analyzer-checkboxes-included-2.png',
        'static/settings/outcome-analyzer-hands.png',
        'static/settings/outcome-analyzer-insights-not-visible.png',
        'static/settings/outcome-analyzer-insights-visible.png',
        'static/settings/saved-ranges-1.png',
        'static/settings/saved-ranges-2.png',
        'static/settings/saved-ranges-3.png',
        'static/settings/saved-ranges-4.png',
        'static/settings/included-selectors/double-slider-selector.png',
        'static/settings/included-selectors/log-double-slider-selector.png',
        'static/settings/included-selectors/saved-ranges-selector.png',
        'static/settings/included-selectors/single-slider-selector.png',
        'static/settings/included-selectors/tier-and-category-selector.png',
        'static/settings/tiers/tiers.png',
        'static/settings/visual/dont-show-num-combos-in-range.png',
        'static/settings/visual/green-grid-squares.png',
        'static/settings/visual/multicolored-grid-squares.png',
        'static/settings/visual/show-num-combos-in-range.png',
      ]).then(function () {
        console.log('Successfully cached everything.')
      }).catch(function (error) {
        console.log('Problem caching: ', error);
      });

      return promise;
    }).catch(function () {
      console.error('Error with caches.open or cache.addAll');
    })
  );
});

self.addEventListener('activate', function(event) {
  event.waitUntil(
    caches.keys()
      .then(function getOldCachesThatBeginWithPremiumPokerToolsDash (cacheNames) {
        return cacheNames.filter(function (cacheName) {
          return cacheName.startsWith('premium-poker-tools-') && (cacheName !== currCacheName);
        });
      })
      .then(function removeOldCachesThatBeginWithPremiumPokerToolsDash (oldCachesThatBeginWithPremiumPokerToolsDash) {
        let removeCachePromises = [];

        oldCachesThatBeginWithPremiumPokerToolsDash.forEach(function (oldCacheThatBeginsWithPremiumPokerToolsDash) {
          removeCachePromises.push(caches.delete(oldCacheThatBeginsWithPremiumPokerToolsDash));
        });

        return Promise.all(removeCachePromises);
      })
  );
});

self.addEventListener('fetch', function(event) {
  event.respondWith(
    caches.match(event.request).then(function (response) {
      if (response) {
        return response;
      }

      return fetch(event.request);
    }).catch(function () {
      console.error('Error trying to match event request to cache.');
    })
  );
});

当我注释掉 'c7d016677eb7e912bc40.worker.js' 和 'f328c7e2b379df12fa4c.worker.js' 时，它工作正常。但是当我取消注释它们时，会发生以下情况:

• 我开始使用 Dev Tools 并注销所有服务工作人员并删除缓存存储中的所有内容，以便从头开始。
• 我加载 localhost:8080。
• Service Worker 保持在 installing 状态。
• 在缓存存储中，我看到 c7d016677eb7e912bc40.worker.js 和 f328c7e2b379df12fa4c.worker.js 已成功缓存。
• 但是，“已成功缓存所有内容。”没有被记录到控制台。但是“问题缓存:”也没有被记录下来。

我明白 the promise you pass to event.waitUntil() lets the browser know when your install completes, and if it was successful.很明显， promise 存在一些问题。但我不知道问题是什么。它没有命中 .then block 或 .catch block ，当我查看开发工具中的缓存存储时，它似乎是 'c7d016677eb7e912bc40.worker。 js' 和 'f328c7e2b379df12fa4c.worker.js' 正在被成功缓存。

编辑:我正在使用 worker-loader .我觉得问题与工作文件的加载方式有关，但我不明白为什么会出现问题，因为当我转到 localhost:8080/c7d016677eb7e912bc40.worker.js 或 localhost:8080/f328c7e2b379df12fa4c.worker.js，我取回 JS 文件。

最佳答案

这并不像你想象的那样有效:

caches.open(currCacheName).then(function(cache) {
  let promise = cache.addAll([

您在这里定义了一个名为 promise 的变量，但它不会替换 cache，这是需要实现的 promise 。

您有大量 Assets 要缓存，然后:

 'static/settings/visual/show-num-combos-in-range.png',
      ]).then(function () {
        console.log('Successfully cached everything.')
      }).catch(function (error) {
        console.log('Problem caching: ', error);
      });

你在这里没有返回任何东西，所以 .then 不会运行，但这不是错误，所以 .catch 也不会。

您的缓存已填充，但您对 extendableEvent.waitUntil() 的 promise 从未得到解决，因此安装永远不会完成。

要么废弃你的 promise 变量/console.logs 并像这样返回 cache.addAll:

self.addEventListener('install', function(event) {
  event.waitUntil(
    caches.open(currCacheName).then(function(cache) {
      return cache.addAll([
        '/',
        'app.js',
        'static/settings/visual/show-num-combos-in-range.png',
      ])
    })
  );
});

或者让你的函数异步，像这样:

self.addEventListener('install', event => {
  event.waitUntil(async function() {
    const cache = await caches.open(currCacheName);
    await cache.addAll([
        '/',
        'app.js',
        'static/settings/visual/show-num-combos-in-range.png',
    ]);
  }());
});

关于javascript - 当我尝试缓存 xxx.worker.js 时，Service Worker 不会安装，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/52265855/