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onmessage = function(evt) {
if (evt.data == "port") {
if (evt.ports) {
postMessage("PASS: Received message port");
evt.ports[0].onmessage = pingBack;
evt.ports[0].start();
} else {
postMessage("FAIL: Did not receive expected MessagePort");
}
} else if (evt.data == "noport") {
if (!evt.ports || evt.ports.length) {
postMessage("FAIL: Received message port or null ports array");
} else {
postMessage("PASS: evt.ports = [] as expected");
}
} else if (evt.data == "spam") {
for (var i = 0 ; i < 1000 ; i++) {
evt.ports[0].postMessage(i);
}
postMessage("spamDone");
} else if (evt.data == "getport") {
var channel = new MessageChannel();
postMessage("port", [channel.port1]);
channel.port2.onmessage = pingBack;
channel.port2.start();
} else {
postMessage("Unknown message:" + evt.data);
}
}
function pingBack(evt) {
// Make sure we got the expected data and send a return message over
// the port.
if (evt.data == "ping") {
evt.target.postMessage("pong");
} else {
postMessage("FAIL: unknown message: " + evt.data);
}
}