1onconnect = function(event) {
2  var port = event.ports[0];
3  port.postMessage("Worker connected.");
4  port.onmessage = function(event2) {
5    port.postMessage("Worker got a port.");
6    var anotherport = event2.data.port;
7    anotherport.start();
8    anotherport.onmessage = function(event3) {
9      anotherport.postMessage("Worker got a message via the passed port.");
10    };
11  };
12}
13