我想尝试在 serviceWorker 中运行 websockets。
我编写了注册serviceWorker的代码:
if ('serviceWorker' in navigator) {
navigator.serviceWorker.register(
GetDataForUser.settings.service_worker + "?version=" + GetDataForUser.settings.service_worker_version,
{scope: './'}
)
.then(() => navigator.serviceWorker
.ready
.then((worker) => {
console.log(worker);
worker.sync.register('syncdata');
})
)
.catch((err) => console.log(err));
navigator.serviceWorker.addEventListener('message', event => {
console.log('++++++++++++++++++++', event.data.msg, event.data.url);
});
}
并编写serviceWorker代码:
var ws = null;
self.addEventListener('install', (event) => {
console.log('Install');
});
self.addEventListener('activate', (event) => {
console.log('Activate');
ws = new WebSocket('ws://local.ll:8880');
ws.onopen = function() {
console.log("Open");
};
// On message receive
ws.onmessage = function (event) {
console.log("Message receive " + event.data);
console.log(event);
event.ports[0].postMessage({'test': 'This is my response.'});
};
// On error connection
ws.onerror = function (error) {
console.log("Error " + error.message);
};
// On close connection
ws.onclose = function (event) {
if (event.wasClean) {
console.log('clean closed');
} else {
console.log('broken connection');
}
console.log('Code: ' + event.code + ' reason: ' + event.reason);
};
});
self.addEventListener('fetch', (event) => {});
self.addEventListener('message', function (evt) {
console.log('postMessage received', evt.data);
ws.send('121212');
});
接下来我尝试将数据发送到 serviceWorker:
navigator.serviceWorker.controller.postMessage({'hello': 'world'});
但收到错误:
Uncaught TypeError: Cannot read property 'postMessage' of null
console.log(navigator.serviceWorker);
ServiceWorkerContainer {controller: null, ready: Promise, oncontrollerchange: null, onmessage: null}
接下来尝试从 serviceWorker 向客户端发送消息:
event.ports[0].postMessage({'test': 'This is my response.'});
但 event.ports 是空的。
怎么了?
如何在client和serviceWorker之间传输数据。