javascript - socket io是什么




io.emit vs socket.emit (2)

我是socket.io的新手并且已经遇到了一些看似很奇怪的事情。 我实际上并不知道socket.emitio.emit之间的socket.emit ,但我无法在任何地方找到解释。

io.on('connection', function(socket){
  io.emit('connected')  // <<<< HERE >> socket.emit('connected');
  socket.on('disconnect', function(){
    io.emit('disconnect')
  });
  socket.on('chat message', function(msg){
    io.emit('chat message', msg);
  });
});

server.listen(3000);

这是我的服务器东西但是当我将io更改为socket ,只有当连接的用户连接时才会显示该消息。 io.emit将消息发送给所有用户。

也许它应该是那样的,或者它只是一些可怕的黑客? 如果您需要客户端HTML,请告诉我。


io变量表示套接字组。 您所拥有的代码从第一行开始,在第二个参数中提供一个函数,每次建立新连接时都会为您提供一个socket变量。 socket变量仅用于与每个单独的连接进行通信。 您可能在代码中看不到它,但每个建立的连接都会有一个socket变量


这是一份补充文件供参考。

socket.emit('message', "this is a test"); //sending to sender-client only
socket.broadcast.emit('message', "this is a test"); //sending to all clients except sender
socket.broadcast.to('game').emit('message', 'nice game'); //sending to all clients in 'game' room(channel) except sender
socket.to('game').emit('message', 'enjoy the game'); //sending to sender client, only if they are in 'game' room(channel)
socket.broadcast.to(socketid).emit('message', 'for your eyes only'); //sending to individual socketid
io.emit('message', "this is a test"); //sending to all clients, include sender
io.in('game').emit('message', 'cool game'); //sending to all clients in 'game' room(channel), include sender
io.of('myNamespace').emit('message', 'gg'); //sending to all clients in namespace 'myNamespace', include sender
socket.emit(); //send to all connected clients
socket.broadcast.emit(); //send to all connected clients except the one that sent the message
socket.on(); //event listener, can be called on client to execute on server
io.sockets.socket(); //for emiting to specific clients
io.sockets.emit(); //send to all connected clients (same as socket.emit)
io.sockets.on() ; //initial connection from a client.

希望这可以帮助!。







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