javascript - socket.io 报错问题

Question

socket.io有个报错，不过链接可以正常使用

服务端：

io.on('connection', function(socket){
        console.log('c')
        socket.emit('news', { hello: 'world' });
        socket.on('my other event', function (data) {
            console.log(data)
        })

        socket.on('disconnect', function () {
            io.sockets.emit('user disconnected');
        });
        socket.on('mes', function(e){
            io.emit('aaa','hahahahahah')
        })

    })

    http.listen(9999, function(){
        console.log('socket on *:9999')
    });

客户端：

this is my page.
<button onclick="connect()">3333</button>
<button onclick="message()">message</button>
<button onclick="dis()">dis</button>

<script type="text/javascript" src="./socket.io.js"></script>
<script type="text/javascript">
var socket
function connect(){
    socket = io.connect('http://localhost:9999');
    socket.on('news', function (data) {
        console.log(data);
        socket.emit('my other event', { my: 'data' });
    });
    socket.on('aaa', function(data){
        console.log(data)
    })
    socket.on('user disconnected', function(){
        console.log('sb disconnected')
    })
}
function message(){
    socket.emit('mes', 123)
}
function dis(){
    socket.disconnect();
}
</script>

Answer 1

灵异事件，整理格式之后就不报错。。。郁闷

Answer 2

服务端那里有点问题吧,

socket.on('disconnect', function () {    
    // 这个时候用户的socket连接已经断掉了, 你还往客户端发送消息, 这样做适合吗? 

    io.sockets.emit('user disconnected');
});