Javascript 脱机时未注册服务工作人员
因此,我创建并成功注册了一个浏览器联机时的服务人员。我可以看到,资源是使用DevTools正确缓存的。问题是,当我切换到脱机模式时,服务人员似乎会注销自己,因此,只会显示google chrome脱机页面 密码Javascript 脱机时未注册服务工作人员,javascript,service-worker,Javascript,Service Worker,因此,我创建并成功注册了一个浏览器联机时的服务人员。我可以看到,资源是使用DevTools正确缓存的。问题是,当我切换到脱机模式时,服务人员似乎会注销自己,因此,只会显示google chrome脱机页面 密码 'use strict'; var CACHE_NAME = 'v1'; var urlsToCache = [ '/' ]; self.addEventListener('install', function(event) { // Perform install steps
'use strict';
var CACHE_NAME = 'v1';
var urlsToCache = [
'/'
];
self.addEventListener('install', function(event) {
// Perform install steps
event.waitUntil(
caches.open(CACHE_NAME)
.then(function(cache) {
console.log('Opened cache');
return cache.addAll(urlsToCache);
})
);
});
self.addEventListener('fetch', function(event) {
event.respondWith(
caches.match(event.request)
.then(function(response) {
// Cache hit - return response
if (response) {
return response;
}
// IMPORTANT: Clone the request. A request is a stream and
// can only be consumed once. Since we are consuming this
// once by cache and once by the browser for fetch, we need
// to clone the response.
var fetchRequest = event.request.clone();
return fetch(fetchRequest).then(
function(response) {
// Check if we received a valid response
if(!response || response.status !== 200 || response.type !== 'basic') {
return response;
}
// IMPORTANT: Clone the response. A response is a stream
// and because we want the browser to consume the response
// as well as the cache consuming the response, we need
// to clone it so we have two streams.
var responseToCache = response.clone();
caches.open(CACHE_NAME)
.then(function(cache) {
cache.put(event.request, responseToCache);
});
return response;
}
);
})
);
});
还有测试脚本,如果有帮助的话
'use strict';
if ('serviceWorker' in navigator) {
navigator.serviceWorker.register('/sw.js').then(function(registration) {
// Registration was successful
console.log('ServiceWorker registration successful with scope: ', registration.scope);
var serviceWorker;
if (registration.installing) {
serviceWorker = registration.installing;
} else if (registration.waiting) {
serviceWorker = registration.waiting;
} else if (registration.active) {
serviceWorker = registration.active;
}
if (serviceWorker) {
console.log('ServiceWorker phase:', serviceWorker.state);
serviceWorker.addEventListener('statechange', function (e) {
console.log('ServiceWorker phase:', e.target.state);
});
}
}).catch(function(err) {
// registration failed :(
console.log('ServiceWorker registration failed: ', err);
});
}
编辑:检查控制台我发现了这个错误。sw.js:1获取脚本时发生未知错误
另外,根据建议,我已经添加了这段代码,但问题仍然存在
this.addEventListener('activate', function(event) {
var cacheWhitelist = ['v2'];
event.waitUntil(
caches.keys().then(function(keyList) {
return Promise.all(keyList.map(function(key) {
if (cacheWhitelist.indexOf(key) === -1) {
return caches.delete(key);
}
}));
})
);
});
似乎您还没有添加任何激活事件,这意味着在可用时呈现缓存元素。希望代码对您有所帮助
self.addEventListener('activate', function(e) {
/*service worker activated */
e.waitUntil(
caches.key().then(function(keyList) {
return Promise.all(keyList.map(function(key) {
if(key){
//remove old cache stuffs
return caches.delete(key);
}
}));
})
);
});
这个问题似乎已经解决了。对于来自谷歌的任何人,请尝试重新启动浏览器。出于安全原因,服务人员仅通过HTTPS运行。请确保!