我有一个简单的服务工作人员与新的服务工作人员在队列中更新按钮。更新后,我想在controllerchange上进行页面刷新,但没有任何反应。总而言之,所有服务工作人员都会进行实时更新,但在该课程之后(https://www.udacity.com/course/offline-web-applications--ud899),他们尝试添加该刷新出于某种原因。服务人员在controllerchange刷新页面
在JS:
const updateButton = document.querySelector('.js-update-btn')
if ('serviceWorker' in navigator) {
navigator.serviceWorker.register('sw.js')
.then(function (reg) {
if (!navigator.serviceWorker.controller) {
return
}
if (reg.waiting) {
updateReady(reg.waiting)
return
}
if (reg.installing) {
trackInstalling(reg.installing)
return
}
reg.addEventListener('updatefound', function() {
trackInstalling(reg.installing)
})
})
var refreshing
navigator.serviceWorker.addEventListener('controllerchange', function() {
if (refreshing) return
window.location.reload()
refreshing = true
})
}
function updateReady (worker) {
updateButton.disabled = false
updateButton.addEventListener('click', function() {
updateButton.disabled = true
worker.postMessage({action: 'skipWaiting'})
})
}
function trackInstalling (worker) {
worker.addEventListener('statechange', function() {
if (worker.state == 'installed') {
updateReady(worker)
}
})
}
在sw.js:
self.addEventListener('message', function (event) {
if (event.data.action == 'skipWaiting') {
self.skipWaiting()
}
})