self.addEventListener('message', function(event) { | |
if ('port' in event.data) { | |
var port = event.data.port; | |
var channel = new MessageChannel(); | |
channel.port1.onmessage = function(event) { | |
if ('pong' in event.data) | |
port.postMessage(event.data.pong); | |
}; | |
// Send a ping message to another service worker. | |
self.registration.waiting.postMessage({ping: channel.port2}, | |
[channel.port2]); | |
} | |
}); |