I'm trying to send message to specific user on nodejs, then save socket.id and nickname as username into array, then get that to send message, but I get this error:

我正在尝试向nodejs上的特定用户发送消息,然后将socket.id和昵称作为用户名保存到数组中,然后将其发送给发送消息,但是我收到此错误:

Cannot read property 'emit' of undefined

This is my code:

这是我的代码:

var socket      = require('socket.io'),
    express     = require('express'),
    app         = express(),
    server      = require('http').createServer(app),
    io          = socket.listen(server);

    io.sockets.on('connection', function (socket) {

        socket.on('login', function (data) {
            login(data.username, data.password, function (success, value) {
                if (success) {
                    usernames[data.username] = socket.id;
                    socket.emit('login', {result: true, id: value});
                } else {
                    socket.emit('login', {result: false});
                }
            });
        });

        socket.on('requestMoney', function (username) {
            log.info('username: ' + username);
            usernames[username].emit('message', {username: 'Hey !!'});
        });
    });

2 个解决方案

    socket.on('login', function (data) {
        login(data.username, data.password, function (success, value) {
            if (success) {
                usernames[data.username] = socket.id;
                io.sockets.emit('login', {result: true, id: value});
            } else {
                io.sockets.emit('login', {result: false});
            }
        });
    });