PWA脱机模式无法从移动浏览器的缓存中加载 [英] PWA offline mode not loading from cache on mobile browsers

问题描述

我写了一个简单的PWA(当前版本获取新闻)在本教程上，由

I wrote a simple PWA (current version) based on this tutorial by Vaadin. It works fine, tested in Chrome, also in offline mode.

通过在移动设备上使用它，会出现问题:

By using it on a mobile device, issues occur:

• 保存PWA后，将其启动一次，即可正常运行.
• 然后在关闭，打开飞行模式并重新启动PWA之后，我收到系统消息，说我没有互联网连接->没问题，我可以忽略
• 忽略后，该应用程序未按预期加载静态资产，但显示空白页面，表示浏览器无法加载该页面，因为我没有互联网连接.

我认为PWA有什么用?为什么不加载静态资产?我认为我的服务人员很好:

I thought that is, what the PWA is good for? Why does it not load the static assets? I think my service-worker is just fine:

const staticAssets = [
    './',
    './styles.css',
    './app.js',
    './images',
    './fallback.json',
    './images/system/offline.png'
]



self.addEventListener('install', async event => {
    const cache = await caches.open('static-assets');
    cache.addAll(staticAssets);
});

self.addEventListener('fetch', event => {
    const req = event.request;
    const url = new URL(req.url);

    if(url.origin === location.origin){
        event.respondWith(cacheFirst(req));
    }else{
        event.respondWith(networkFirst(req));
    }

});


async function cacheFirst(req){
    const cachedResponse = await caches.match(req);
    return cachedResponse || fetch(req);
}

async function networkFirst(req){
    const cache = await caches.open('dynamic-content');
    try{
        const res = await fetch(req);
        cache.put(req, res.clone());
        return res;
    }catch(err){
        const cachedResponse = await cache.match(req);
        return cachedResponse || caches.match('./fallback.json');
    }
}

如果您认为问题出在其他地方，我很乐意分享更多代码！

I'm happy to share more code, if you think the problem is somewhere else!

推荐答案

问题出在服务人员内部:

The problem was within the service-worker:

我忘记了将服务工作者文件添加到静态资产中.

I forgot to add the service worker file to the static assets.

通过阅读以下问题的答案来找到解决方案: https://stackoverflow.com/a/44482764/7350000.

Found the solution by reading the answers of this question: https://stackoverflow.com/a/44482764/7350000.

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