Socket.io房间的broadcast.to和sockets.in之间的区别

Socket.io的自述文件包含以下示例：

    var io = require('socket.io').listen(80);

    io.sockets.on('connection', function (socket) {
      socket.join('justin bieber fans');
      socket.broadcast.to('justin bieber fans').emit('new fan');
      io.sockets.in('rammstein fans').emit('new non-fan');
    });

socket.broadcast.to()和之间有什么区别io.sockets.in()？

socket.broadcast.to广播在给定房间中所有的插座，除外到它被调用而插座io.sockets.in广播在给定房间内的所有插座。

Node.js一直是我真正感兴趣的东西，我在一个项目中使用它来制作多人游戏。

io.sockets.in().emit()这socket.broadcast.to().emit()是我们在Socket.io的房间（https://github.com/LearnBoost/socket.io/wiki/Rooms）中使用的主要两种发出方法。房间允许对连接的客户端进行简单分区。这允许将事件与连接的客户端列表的子集一起发出，并提供一种简单的方法来管理它们。

它们使我们能够管理连接的客户端列表的子集（我们称为房间），并具有类似的功能，例如main socket.io函数io.sockets.emit()和socket.broadcast.emit()。

无论如何，我将尝试给出示例代码以及注释以进行解释。看看是否有帮助；

Socket.io房间

i）io.sockets.in（）。emit（）;

/* Send message to the room1. It broadcasts the data to all 
   the socket clients which are connected to the room1 */

io.sockets.in('room1').emit('function', {foo:bar});

ii）socket.broadcast.to（）。emit（）;

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

        /* Broadcast to room1 except the sender. In other word, 
            It broadcast all the socket clients which are connected 
            to the room1 except the sender */
        socket.broadcast.to('room1').emit('function', {foo:bar});

    }
}

套接字

i）io.sockets.emit（）;

/* Send message to all. It broadcasts the data to all 
   the socket clients which are connected to the server; */

io.sockets.emit('function', {foo:bar});

ii）socket.broadcast.emit（）;

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

        // Broadcast to all the socket clients except the sender
        socket.broadcast.emit('function', {foo:bar}); 

    }
}

干杯

更新2019：socket.io是一个特殊的模块，它使用websockets然后回退到http请求轮询。仅用于websocket：对于客户端，请使用本机websocket；对于node.js，请使用ws或此库。

简单的例子

语法在socketio中令人困惑。此外，每个套接字都将使用id自动连接到自己的房间socket.id（这是在socketio中私人聊天的工作方式，他们使用房间）。

发送给发件人，没有其他人

socket.emit('hello', msg);

发送给“我的房间”房间中的所有人，包括发件人（如果发件人在房间中）

io.to('my room').emit('hello', msg);

发送给“我的房间”房间中除发件人（如果发件人在房间内）以外的所有人

socket.broadcast.to('my room').emit('hello', msg);

发送给每个房间中的每个人，包括发件人

io.emit('hello', msg); // short version

io.sockets.emit('hello', msg);

仅发送到特定的套接字（私人聊天）

socket.broadcast.to(otherSocket.id).emit('hello', msg);

io.on('connect', onConnect);

function onConnect(socket){

  // sending to the client
  socket.emit('hello', 'can you hear me?', 1, 2, 'abc');

  // sending to all clients except sender
  socket.broadcast.emit('broadcast', 'hello friends!');

  // sending to all clients in 'game' room except sender
  socket.to('game').emit('nice game', "let's play a game");

  // sending to all clients in 'game1' and/or in 'game2' room, except sender
  socket.to('game1').to('game2').emit('nice game', "let's play a game (too)");

  // sending to all clients in 'game' room, including sender
  io.in('game').emit('big-announcement', 'the game will start soon');

  // sending to all clients in namespace 'myNamespace', including sender
  io.of('myNamespace').emit('bigger-announcement', 'the tournament will start soon');

  // sending to a specific room in a specific namespace, including sender
  io.of('myNamespace').to('room').emit('event', 'message');

  // sending to individual socketid (private message)
  io.to(`${socketId}`).emit('hey', 'I just met you');

  // WARNING: `socket.to(socket.id).emit()` will NOT work, as it will send to everyone in the room
  // named `socket.id` but the sender. Please use the classic `socket.emit()` instead.

  // sending with acknowledgement
  socket.emit('question', 'do you think so?', function (answer) {});

  // sending without compression
  socket.compress(false).emit('uncompressed', "that's rough");

  // sending a message that might be dropped if the client is not ready to receive messages
  socket.volatile.emit('maybe', 'do you really need it?');

  // specifying whether the data to send has binary data
  socket.binary(false).emit('what', 'I have no binaries!');

  // sending to all clients on this node (when using multiple nodes)
  io.local.emit('hi', 'my lovely babies');

  // sending to all connected clients
  io.emit('an event sent to all connected clients');

};

在Socket.IO 1.0中，.to（）和.in（）相同。房间中的其他人也会收到该消息。客户端发送它不会收到该消息。

签出源代码（v1.0.6）：

https://github.com/Automattic/socket.io/blob/a40068b5f328fe50a2cd1e54c681be792d89a595/lib/socket.js#L173