Node.js 套接字事件之间的差异

以下两者之间的区别是什么：

io.sockets.socket();
io.sockets.emit();
io.sockets.on();

sockets.on();
socket.broadcast.emit();
socket.emit();

谁能给我解释一下这两者的区别吗？我知道，sockets.on（）；是一个事件侦听器，但我不知道区别

而且。。。如何将这两行合并为一行

socket.on('msg_user', function(usr, username, msg) {
    io.sockets.socket(usernames[usr]).emit('msg_user_handle', username, msg);
    io.sockets.socket(usernames[username]).emit('msg_user_handle', username, msg);
});

我可以使用io.sockets.emit（）；但我不想在所有连接的套接字中发射，只在消息发送方和接收方上发射

这是我的整个应用程序

app.js

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

server.listen(8008);

// usernames which are currently connected to the chat
//var usernames = {};
var usernames = new Object();

function check_key(v) {
    var val = '';

    for(var key in usernames) {
        if(usernames[key] == v)
        val = key;
    }
    return val;
}

io.sockets.on('connection', function (socket) {
    // when the client emits 'adduser', this listens and executes
    socket.on('adduser', function(username){
        // we store the username in the socket session for this client
        socket.username = username;
        // add the client's username to the global list
        usernames[username] = socket.id;
        // echo to client they've connected
        socket.emit('updatechat', 'server', 'you have connected');
        // echo globally (all clients) that a person has connected
        socket.broadcast.emit('updatechat', 'SERVER', username + ' has connected: ' + socket.id);
        // update the list of users in chat, client-side
        io.sockets.emit('updateusers', usernames);
    });

    // when the user disconnects.. perform this
    socket.on('disconnect', function(){
        // remove the username from global usernames list
        delete usernames[socket.username];
        // update list of users in chat, client-side
        io.sockets.emit('updateusers', usernames);
        // echo globally that this client has left
        socket.broadcast.emit('updatechat', 'SERVER', socket.username + ' has disconnected');
    });

    // when the user sends a private msg to a user id, first find the username
    socket.on('check_user', function(asker, id){
        io.sockets.socket(usernames[asker]).emit('msg_user_found', check_key(id));
    });

    // when the user sends a private message to a user.. perform this
    socket.on('msg_user', function(usr, username, msg) {
        io.sockets.socket(usernames[usr]).emit('msg_user_handle', username, msg);
        io.sockets.socket(usernames[username]).emit('msg_user_handle', username, msg);
    });
});

var socket = io.connect('http://localhost:8008');   

//set username
var my_username = $("#user_data_for_mess").attr("my_username");
var username = $("#user_data_for_mess").attr("username");

// on connection to server, send user's name with an anonymous callback
socket.on('connect', function() {
    // call the server-side function 'adduser' and send one parameter (my_username)
    socket.emit('adduser', my_username);
});

// listener, whenever the server emits 'updatechat', this updates the chat body
socket.on('updatechat', function (username, data) {
    $('#show_conversation').append(data);
});

// listener, whenever the server emits 'msg_user_found'
socket.on('msg_user_found', function (username) {
    $('#message').keypress(function(e) {
        if(e.which == 13) {
            var message = $('#message').val();
            if($.trim(message).length != 0) {
                socket.emit('msg_user', username, my_username, message);
                $('#message').val('');
            }
        }
    });
});

socket.on('updateusers', function(data) {
    socket.emit('check_user', my_username, data[username]);
});

// listener, whenever the server emits 'msg_user_handle', this updates the chat body
socket.on('msg_user_handle', function (username, data) {
    $('#show_conversation').append(username + ": " + data);         
});

client.js

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

server.listen(8008);

// usernames which are currently connected to the chat
//var usernames = {};
var usernames = new Object();

function check_key(v) {
    var val = '';

    for(var key in usernames) {
        if(usernames[key] == v)
        val = key;
    }
    return val;
}

io.sockets.on('connection', function (socket) {
    // when the client emits 'adduser', this listens and executes
    socket.on('adduser', function(username){
        // we store the username in the socket session for this client
        socket.username = username;
        // add the client's username to the global list
        usernames[username] = socket.id;
        // echo to client they've connected
        socket.emit('updatechat', 'server', 'you have connected');
        // echo globally (all clients) that a person has connected
        socket.broadcast.emit('updatechat', 'SERVER', username + ' has connected: ' + socket.id);
        // update the list of users in chat, client-side
        io.sockets.emit('updateusers', usernames);
    });

    // when the user disconnects.. perform this
    socket.on('disconnect', function(){
        // remove the username from global usernames list
        delete usernames[socket.username];
        // update list of users in chat, client-side
        io.sockets.emit('updateusers', usernames);
        // echo globally that this client has left
        socket.broadcast.emit('updatechat', 'SERVER', socket.username + ' has disconnected');
    });

    // when the user sends a private msg to a user id, first find the username
    socket.on('check_user', function(asker, id){
        io.sockets.socket(usernames[asker]).emit('msg_user_found', check_key(id));
    });

    // when the user sends a private message to a user.. perform this
    socket.on('msg_user', function(usr, username, msg) {
        io.sockets.socket(usernames[usr]).emit('msg_user_handle', username, msg);
        io.sockets.socket(usernames[username]).emit('msg_user_handle', username, msg);
    });
});

var socket = io.connect('http://localhost:8008');   

//set username
var my_username = $("#user_data_for_mess").attr("my_username");
var username = $("#user_data_for_mess").attr("username");

// on connection to server, send user's name with an anonymous callback
socket.on('connect', function() {
    // call the server-side function 'adduser' and send one parameter (my_username)
    socket.emit('adduser', my_username);
});

// listener, whenever the server emits 'updatechat', this updates the chat body
socket.on('updatechat', function (username, data) {
    $('#show_conversation').append(data);
});

// listener, whenever the server emits 'msg_user_found'
socket.on('msg_user_found', function (username) {
    $('#message').keypress(function(e) {
        if(e.which == 13) {
            var message = $('#message').val();
            if($.trim(message).length != 0) {
                socket.emit('msg_user', username, my_username, message);
                $('#message').val('');
            }
        }
    });
});

socket.on('updateusers', function(data) {
    socket.emit('check_user', my_username, data[username]);
});

// listener, whenever the server emits 'msg_user_handle', this updates the chat body
socket.on('msg_user_handle', function (username, data) {
    $('#show_conversation').append(username + ": " + data);         
});

---

您目前解决私人消息传递的方式很好。我也在其他一些项目中使用了它，效果非常好。您可能还可以使用socket.join（）解决此问题。

谢谢，我如何使用socket.join（）？加入“聊天室”很有用，因为你正在聊天（）。但是对于私有消息，我认为在这种情况下io.sockets.socket工作得足够好。我想稍后使用sockets实现一个通知系统，我认为这可能会有所帮助。再次感谢：）