text: const io = require('socket.io-client')
  
  const manager = new io.Manager('http://localhost:7777')
  
  const nsp = manager.socket('/nsp')
  
  nsp.on('connect', function() {
    console.log('connected')
  })
  
  nsp.on('callback', function (data) {
    console.log('callback ', data)
  })
  
  const msg = 'test message 中文'
  nsp.emit('event', msg)
  