我在 HTML5 中运行单页登陆，我使用了 bitsofcode 的教程 ( https://bitsofco.de/setting-up-a-basic-service-worker/ ) 来实现我的第一个服务 worker 。
页面在 one.com 上设置并通过 cloudflare 运行。
我已经添加了一些缓存文件，但其他的是它的源文件是完整的。
Chrome 控制台给我这个错误:
Uncaught (in promise) DOMException service-worker.js:1
我知道它会启动，因为在我得到错误之前:
[ServiceWorker] Installed [ServiceWorker] Caching cacheFiles
查看日志，我看到了这些消息:
Console: {
"lineNumber":24,
"message":"[ServiceWorker] Installed",
"message_level":1,
"sourceIdentifier":3,
"sourceURL":"https://WWW.MYURL.COM/service-worker.js"
}
Console: {
"lineNumber":33,
"message":"[ServiceWorker] Caching cacheFiles",
"message_level":1,
"sourceIdentifier":3,
"sourceURL":"https://WWW.MYURL.COM/service-worker.js"
}
Error: {
"columnNumber":-1,
"lineNumber":-1,
"message":"ServiceWorker failed to install: ServiceWorker failed to handle event (event.waitUntil Promise rejected)",
"sourceURL":""
}
Console: {
"lineNumber":0,
"message":"Uncaught (in promise) InvalidStateError: Cache.addAll(): duplicate requests (https://WWW.MYURL.COM/favicon-32x32.png)",
"message_level":3,
"sourceIdentifier":1,
"sourceURL":"https://WWW.MYURL.COM/service-worker.js"
}
服务 worker .js
var cacheName = 'v7';
// Default files to always cache
var cacheFiles = [
'./',
'./index.html',
'./favicon-96x96.png',
'./favicon-196x196.png',
'./favicon-128.png',
'./favicon-16x16.png',
'./favicon-32x32.png',
'./favicon-32x32.png',
'./manifest.json',
'./assets/css/images/bg2.jpg',
'./assets/css/images/bg2.webp',
'./assets/css/font-awesome.min.css',
'./assets/fonts/fontawesome-webfont.woff2?v=4.7.0',
'./assets/css/main.css',
'https://fonts.googleapis.com/css?family=Source+Sans+Pro:300,900'
]
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);
})
); // 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
});
和 SW 的注册(放在我的 html 正文的最后)
<script type="text/javascript">
if ('serviceWorker' in navigator) {
navigator.serviceWorker.register('service-worker.js');
};
</script>
最佳答案
您不能多次将相同的资源提供给 Cache.addAll。
您有两次 favicon-32x32.png。您也可以从最后一条控制台消息中看到这一点 :)
关于javascript - Service Worker 抛出错误 "Uncaught (in promise) DOMException"，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/55733682/