node.js 与websocket通信的简单问题

[php-木子]

var WebSocketServer = require('ws').Server,
wss = new WebSocketServer({ port: 8888 });
wss.on('connection', function (ws) {
    console.log('client connected');
    ws.on('message', function (message) {
        console.log(message);
    });
    ws.send('something');
});
console.log('test');

node server.js之后 显示了 someting 但是没有显示 client connected help.