javascript - Service Worker 已注册并激活但无法在离线模式下工作

Question

在 UI5 应用程序中，我已经在 index.html 中注册了我的服务 worker :

$(document).ready(function() {
  if ('serviceWorker' in navigator) {
    navigator.serviceWorker
      .register('service-worker.js', { scope: './' })
      .then(function(registration) {
        console.log("Service Worker Registered");
      })
      .catch(function(err) {
        console.log("Service Worker Failed to Register", err);
      })
  }
});

此外，我在根文件夹中有文件 service-worker.js 以便服务 worker 可以缓存它下面的所有元素。该文件包含以下代码:

// Set a name for the current cache
var cacheName = 'v2'; 

// Default files to always cache
var cacheFiles = [
    './',
    './inicio.html?I_APLICACION=CAPCGENA02',
    './resources/sap-ui-core.js',
    './resources/sap/ui/core/themes/base/fonts/SAP-icons.ttf',
    './resources/sap-ui-core.js',
    './resources/sap/ui/core/library-preload.js',
    './resources/sap/m/library-preload.js',
    './resources/sap/ui/unified/library-preload.js',
    './resources/sap/ui/comp/library-preload.js',
    './resources/sap/ui/table/library-preload.js',
    './resources/sap/ui/fl/library-preload.js',
    './resources/sap/tnt/library-preload.js',
    './resources/sap/ui/unified/themes/sap_belize/library-parameters.json',
    './resources/sap/ui/table/themes/sap_belize/library-parameters.json',
    './resources/sap/ui/comp/themes/sap_belize/library-parameters.json',
    './resources/sap/tnt/themes/sap_belize/library-parameters.json',
    './resources/sap/ui/layout/library-preload.js',
    './resources/sap/ui/unified/themes/sap_belize/library.css',
    './resources/sap/ui/table/themes/sap_belize/library.css',
    './resources/sap/ui/comp/themes/sap_belize/library.css',
    './resources/sap/tnt/themes/sap_belize/library.css',
    './css/style.css',
    './css/fonts/ttf/CMEEMEN18.ttf',
    './images/temporal/chart.PNG',
    './Component.js',
    './Component-preload.js',
    './manifest.json',
    './api/api.reformation.data.js',
    './api/ApiManager.js',
    './api/ApiStructure.js',
    './api/ibd.api.login.data.js',
    './controller/Home.controller.js',
    './controller/Login.controller.js',
    './controller/Menu.controller.js',
    './controller/fragment/ManagePartes.js',
    './controller/fragment/FilterDialogController.js',
    './controller/structure/Container.controller.js',
    './controller/structur
    './database/apiBBDD.js',
    './database/bbdd.js',
    './i18n/i18n.properties',
    './i18n/i18n_en.properties',
    './i18n/i18n_es.properties',
    './i18n/i18n_en_US.properties',
    './i18n/i18n_es_ES.properties',
    './manager/dataManager/DataManager.js',
    './manager/functionalityManager/FunctionalityManager.js',
    './manager/mappingManager/MappingManager.js',
    './manager/parserManager/ReformationParser.js',
    './manager/sessionManager/SessionManager.js',
    './manager/structureManager/ElementManager.js',
    './manager/structureManager/StructureManager.js',
    './manager/viewManager/ViewManager.js',
    './singleton/Singleton.js',
    './utils/Consts.js',
    './utils/Funcionality.js',
    './utils/FunctionalityEvent.js',
    './utils/MaskedPassword.js',
    './utils/Utils.js',
    './view/Home.view.xml',
    './view/Login.view.xml',
    './view/Menu.view.xml',
    './view/fragment/DialogConfirm.fragment.xml',
    './view/fragment/DialogEnd.fragment.xml',
    './view/fragment/DialogError.fragment.xml',
    './view/fragment/DialogTag.fragment.xml',
    './view/fragment/DialogWaiting.fragment.xml',
    './view/fragment/HistoryDialog.fragment.xml',
    './view/fragment/HistoryNoticeDialog.fragment.xml',

]


self.addEventListener('install', function(e) {
    console.log('[ServiceWorker] Installed');

    // e.waitUntil Delays the event until the Promise is resolved
    e.waitUntil(

        // Open the cache
        caches.open(cacheName).then(function(cache) {

            // Add all the default files to the cache
            console.log('[ServiceWorker] Caching cacheFiles');
            //return cache.addAll(cacheFiles);
            return cache.addAll(cacheFiles.map(url => new Request(url, {credentials: 'same-origin'})));
        })
    ); // end e.waitUntil
});


self.addEventListener('activate', function(e) {
    console.log('[ServiceWorker] Activated');

    e.waitUntil(

        // Get all the cache keys (cacheName)
        caches.keys().then(function(cacheNames) {
            return Promise.all(cacheNames.map(function(thisCacheName) {

                // If a cached item is saved under a previous cacheName
                if (thisCacheName !== cacheName) {

                    // Delete that cached file
                    console.log('[ServiceWorker] Removing Cached Files from Cache - ', thisCacheName);
                    return caches.delete(thisCacheName);
                }
            }));
        })
    ); // end e.waitUntil

});


self.addEventListener('fetch', function(e) {
    console.log('[ServiceWorker] Fetch', e.request.url);

    // e.respondWidth Responds to the fetch event
    e.respondWith(

        // Check in cache for the request being made
        caches.match(e.request)


            .then(function(response) {

                // If the request is in the cache
                if ( response ) {
                    console.log("[ServiceWorker] Found in Cache", e.request.url, response);
                    // Return the cached version
                    return response;
                }

                // If the request is NOT in the cache, fetch and cache

                var requestClone = e.request.clone();
                fetch(requestClone)
                    .then(function(response) {

                        if ( !response ) {
                            console.log("[ServiceWorker] No response from fetch ")
                            return response;
                        }

                        var responseClone = response.clone();

                        //  Open the cache
                        caches.open(cacheName).then(function(cache) {

                            // Put the fetched response in the cache
                            cache.put(e.request, responseClone);
                            console.log('[ServiceWorker] New Data Cached', e.request.url);

                            // Return the response
                            return response;

                        }); // end caches.open

                    })
                    .catch(function(err) {
                        console.log('[ServiceWorker] Error Fetching & Caching New Data', err);
                    });


            }) // end caches.match(e.request)
    ); // end e.respondWith
});

有了这一切，我就可以正确安装和激活我的 service worker。如果我转到“缓存存储”选项卡，我会缓存信息:

我的连接是安全的 (HTTPS)，但是当我进入离线模式时，请求从缓存磁盘而不是服务 worker 返回。

我猜这是因为它是从浏览器的自动缓存中获取的，但是如果我在 Chrome 中单击“禁用缓存”选项，它不会加载离线页面。

有人知道为什么会这样吗？

Answer 1

这是对 "Has anyone worked on Service Worker Implementation in SAPUI5?" 的回答
引用自 MDN :

[Service Worker] is designed to be fully async; as a consequence, APIs such as synchronous XHR [...] can't be used inside a service worker.

所以目前，Service Worker doesn't intercept sync XHRs UI5 确实发送了许多同步 XHR，这解释了为什么 those files are not intercepted .

因此，尽量减少同步 XHRs explained in here .

1. 创建组件预加载文件

2. 尽可能在所有地方设置 async: true。例如

   • 对于组件

     sap.ui.component({
       manifestUrl: "...",
       async: true,
     })
     

   • Root View (在应用描述符中)

     rootView : {
       viewName: "...",
       type: "XML",
       async: true,
       ...
     },
     

3. 通过 Bootstrap 配置preload 异步加载库，值为"async"。例如:

   data-sap-ui-preload="async"
   

4. 启用 xx-waitForTheme 预加载库。例如:

   data-sap-ui-libs="sap.m, sap.ui.core, sap.f"
   data-sap-ui-xx-waitForTheme="true"
   

我也看到了 you have some fragments .避免通过 fragment factory 延迟加载控件因为片段是通过这种方式同步获取的。