Socket.io房间broadcast.to和sockets.in的区别

Question

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 io.sockets.in() 之间有什么区别？

Answer 1

socket.broadcast.to 向给定房间中的所有套接字广播，除了在 io.sockets.in 时调用它的套接字向给定房间中的所有套接字广播。

Answer 2

2019 年更新：socket.io 是一个特殊模块，它使用 websockets，然后回退到 http 请求轮询。仅适用于 websockets：对于客户端，请使用本机 websockets；对于 Node.js，请使用 ws 或此库。

简单示例

socketio 中的语法很混乱。此外，每个套接字都会自动连接到自己的房间，其 ID 为 socket.id（这就是在 socketio 中私人聊天的工作方式，他们使用房间）。

发送给发件人，而不是其他人

socket.emit('hello', msg);

发送给房间“我的房间”中的所有人，包括发件人（如果发件人在房间内） /em>

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

发送给房间“我的房间”中除发件人之外的所有人（如果发件人在房间内）

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

发送给每个中的每个人房间，包括发送者

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

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

仅发送到特定套接字（私人聊天）

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

Answer 3

Node.js 是我有一段时间真正感兴趣的东西，我在我的一个项目中使用它来制作一款多人游戏。

io.sockets.in().emit() 和 socket.broadcast.to().emit() 是我们在 Socket.io 的 Rooms 中使用的两个主要的发射方法(https://github.com/LearnBoost/socket.io/wiki/Rooms) 房间允许简单连接的客户端的分区。这允许将事件发送到已连接客户端列表的子集，并提供管理它们的简单方法。

它们允许我们管理已连接客户端列表的子集（我们称之为房间），并具有类似的功能，例如主 socket.io 函数 io.sockets.emit() 和 socket。广播.emit()。

无论如何，我会尝试给出示例代码和注释来解释。看看是否有帮助；

Socket.io Rooms

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});

    }
}

Socket.io

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

Answer 4

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');

};

Answer 5

在Socket.IO 1.0中，.to()和.in()是相同的。房间里的其他人也会收到该消息。客户端发送的消息不会收到。

查看源代码（v1.0.6）：

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