text: const WebSocket = require('ws');
  
  const ws = new WebSocket('ws://121.40.137.1:9922');
  //const ws = new WebSocket('ws://localhost:9922');
  
  ws.on('open', function open() {
    ws.send('client message');
  });
  
  ws.on('message', function incoming(data) {
    console.log('receive server msg', data);
  });
  