socket.io的方法回调

Question

server.js

socket.on('adduser', username, successcallback){ 

if(users.hasOwnProperty(username)){ 

} else { 

    socket.username = username; 

    users[username] = { name: username }; 

    socket.emit('updatechat', 'SERVER', 'you have connected'); 

    socket.broadcast.emit('updatechat', 'SERVER', username + ' has connected'); 

    io.sockets.emit('updateusers', users); 

    successcallback({ msg: 'User ' + username + ' has been successfully added' }); 
} 

}); 

的index.html

socket.on('connect', function(){ 

    var username = prompt('Whats your name?'); 

    socket.emit('adduser', username, function(data){ 
     console.log(data); 
    }); 

}); 

这使我的应用程序崩溃。这不是应该如何实现回调吗？

Answer 1

adduser消息处理程序的定义缺少function(...)。它应该是：

socket.on('adduser', function(username, successcallback) { 
    ... 
});