服务端代码，有一个问题 handshakeData.username = username; 这个好像不起作用

var connectedUsers = [];

io.set('authorization', function (handshakeData, callback) {
  var signedCookies = require('express/node_modules/cookie').parse(handshakeData.headers.cookie);
  handshakeData.cookies = require('express/node_modules/connect/lib/utils').parseSignedCookies(signedCookies, settings.cookie_secret);
  sessionStore.get(handshakeData.cookies['connect.sid'], function(err, session) {
    if (err) {
      callback(err, false);
      return;
    }
    var username = session.user && session.user.name;
    handshakeData.username = username;  //这个好像不起作用
    console.log('authorization', username);
    console.dir(connectedUsers);
    if (connectedUsers.indexOf(username) !== -1) {
      //重复登录
      console.log('重复登录');
      callback('重复登录', false);
    } else {
      connectedUsers.push(username);
      callback(null, true);
    }
  });
  //callback(null, false);
});

io.of('/client').on('connection', function (socket) {
  socket.emit('agents', agents);
  socket.emit('rate', rate);
  //socket.handshake.username
  console.log('client connect:', socket.client.request.username);
  //client下线
  socket.on('disconnect', function() {
    console.log('disconnect', socket.client.request.username);//socket.handshake.username);
    connectedUsers.splice(connectedUsers.indexOf(socket.client.request.username), 1);
    });
});

客户端代码

var client = io.connect('/client');
// 下面代码参考官方文档，但没有收到连接失败端消息，请大家指正
client.on('connect_failed', function (reason) {
    console.log('unable to connect to namespace', reason);
});