如何基于nodejs搭建 websocket

var sys = require("sys"),
ws = require("./ws");

ws.createServer(function (websocket) {
websocket.addListener("connect", function (resource) {
// emitted after handshake
sys.debug("connect: " + resource);

// server closes connection after 10s, will also get "close" event
setTimeout(websocket.end, 10 * 1000);
}).addListener("data", function (data) {
// handle incoming data
sys.debug(data);

// send data to client
websocket.write("Thanks!");
}).addListener("close", function () {
// emitted when server or client closes connection
sys.debug("close");
});
}).listen(8080);