src/explorer/index.js
function connect (url, callback) {
  io = SocketIO.connect(url)
  io.on('connect', callback)
}
function connect (url, callback) {
  io = SocketIO.connect(url)
  io.on('connect', callback)
}
function connect ( url , callback ) { io = SocketIO . connect ( url ) io . on ( 'connect' , callback ) }
connect to the sig-server
connect to the sig - server