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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);
};
self.registration.active.postMessage({ping: channel.port2},
[channel.port2]);
} else if ('ping' in event.data) {
event.data.ping.postMessage({pong: 'OK'});
}
});