信号R，客户端javascript函数未被调用

Question

我正在创建一个聊天室演示应用程序，因为我正在尝试学习信号r。我的问题是，当从服务器上的chathub类中的connect方法尝试时，我的javascript客户端函数没有被调用。

LoadChatRoomContent客户端javascript函数仅在页面启动时执行。而不是当我从服务器集线器功能中调用它时。

有什么想法吗？

客户端

<script type="text/javascript">

   **View Model**

var chatViewModel   = {
chat: $.connection.chatHub, 
connectToLobby: function () {
                this.chat.server.connect(this.userName());
    },
)


 $(function () {
   var chat = $.connection.chatHub;
   ko.applyBindings(chatViewModel);  

     // client side signalr functions

  chat.client.newUserHasJoined = function (userName) {
                //$('#chatContent').append(userName + "has joined");
                chatViewModel.latestChatContent.append(userName + "has joined");

                // update the users online list when a new member has joined
                chatViewModel.onlineUserList.push(userName);


            }; 

 chat.client.loadChatRoomContent = new function (messageHistory, userList) {

                // convert json string to javascript array so that it can be iterated.
                chatViewModel.onlineUserList = $.parseJSON(userList);

                //
                chatViewModel.latestChatContent = $.parseJSON(messageHistory);

                alert("it works");
            };    

           $.connection.hub.start();

        });

**Chat Hub**
 public class ChatHub : Hub
{
    List<connectedUsers> _currentUsers;

    // stores up to 100 messages
    List<string> _messageCache;

    public ChatHub(){
        _currentUsers = new List<connectedUsers>();
        _messageCache = new List<string>();
    }

    public void Connect(string userName)
    {
        // add new user to the list
        lock (_currentUsers)
        {
            _currentUsers.Add(new connectedUsers() { Id = Guid.NewGuid(), userName = userName });
        }
        //let other users know of the new member
        Clients.AllExcept(Context.ConnectionId).newUserHasJoined(userName);

        // send chat messages and current UsersList to caller only
        // both objects sent as json string format.
        Clients.Caller.loadChatRoomContent( new JavaScriptSerializer().Serialize(_messageCache),new JavaScriptSerializer().Serialize(_currentUsers));
    }

}