Socket.io发射不起作用，但广播可以

Question

I'm trying to emit a notification to a single client but the emit does not seems to fire at all whereas broadcast.emit works fine. But the problem is broadcast is notifying all clients even if I supply the socket.id.

Anyone have any idea what I did wrong?

var app = express( );
var querystring = require('querystring');
var server  = http.createServer(app);
var io = require('socket.io').listen(server);
var clients = {};

io.sockets.on('connection', function( socket ) {
    socket.on( 'subscribe', function( userID ) {
        clients[userID] = socket.id;
    });

    socket.on( 'notifyMsg', function( data ) {
        var obj = JSON.parse( data );
        for( var i=0; i<obj.info.notifyUserIDs.length; i++ ) {
            var to = clients[obj.info.notifyUserIDs[i]];
            if( to ) {
                // Doesn't work
                io.sockets.socket(to).emit( 'notification', data );

                // Works
                //io.sockets.socket(to).broadcast.emit( 'notification', data );
            }
        }
    });
});

Answer 1

What do you think about storing the sockets itself in the client hash and using it like this?

var app = express( );
var querystring = require('querystring');
var server  = http.createServer(app);
var io = require('socket.io').listen(server);
var clients = {};

io.sockets.on('connection', function( socket ) {
    socket.on( 'subscribe', function( userID ) {
        clients[userID] = socket;
    });

    socket.on( 'notifyMsg', function( data ) {
        var obj = JSON.parse( data );
        for( var i=0; i<obj.info.notifyUserIDs.length; i++ ) {
            var to = clients[obj.info.notifyUserIDs[i]];
            if( to ) {
                to.emit( 'notification', data );
            }
        }
    });
});