io.sockets.emit和socket.broadcast.emit有什么区别？广播只是向所有人发出但发送它的套接字吗？

似乎它们可以互换使用：

io.sockets.on('connection', function (socket) {
  //these should do the same thing  
  io.sockets.emit('this', { receivers: 'everyone'});

  socket.broadcast.emit('this', { receivers: 'everyone but socket'}); //emits to everyone but socket
  socket.emit('this', { receivers: 'socket'}); //emits to socket
});