self.addEventListener('install', (event) => {
    console.log('Service Worker 安装')
})
  
self.addEventListener('activate', (event) => {
    console.log('Service Worker 激活')
})

self.addEventListener('fetch', (event) => {
    console.log('Fetch intercepted for:', event.request.url)
    self.clients.matchAll().then(clients => {
        clients.forEach(client => {
            client.postMessage('Hello from Service Worker')
        })
    })
})

self.addEventListener('message', event => {
    console.log('收到主线程消息: ', event.data)
})