限制套接字io连接数

您可以很容易地实现:

var connectionsLimit = 1

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

  if (io.engine.clientsCount > connectionsLimit) {
    socket.emit('err', { message: 'reach the limit of connections' })
    socket.disconnect()
    console.log('Disconnected...')
    return
  }

})