Socket.io 房间广播.to 和 sockets.in 之间的区别

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() 有什么区别？

Answer 1

socket.broadcast.to 广播到给定房间中的所有套接字，除了 到调用它的套接字，而io.sockets.in 广播到给定房间中的所有套接字。

Answer 2

Node.js 曾经是我真正感兴趣的东西，我在我的一个项目中使用它来制作多人游戏。

io.sockets.in().emit() 和 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射方法，房间允许对连接的客户端进行简单的分区。这允许将事件发送到已连接客户端列表的子集，并提供一种简单的管理方法。

它们允许我们管理连接的客户端列表（我们称之为房间）的子集，并具有类似的功能，如 socket.io 的主函数 io.sockets.emit() 和 socket.broadcast.emit()。

无论如何我会尝试给出带有cmets的示例代码来解释。看看有没有帮助；

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});

    }
}

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 3

2019 年更新：socket.io 是一个特殊的模块，它使用 websockets，然后回退到 http 请求轮询。仅适用于 websockets：客户端使用原生 websockets，node.js 使用 ws 或这个库。

简单示例

socketio 中的语法令人困惑。此外，每个套接字都会自动连接到 ID 为 socket.id 的自己的房间（这是在 socketio 中进行私人聊天的方式，他们使用房间）。

发送给发件人，而不是其他人

socket.emit('hello', msg);

发送给所有人包括发件人（如果发件人在房间里）房间“我的房间”

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

发送给所有人除了发件人（如果发件人在房间里）在房间“我的房间”

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);

仅发送到特定套接字（私人聊天）

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

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。房间里的其他人将收到该消息。客户端发送它不会收到消息。

查看源代码（v1.0.6）：

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