text: import React from 'react'
  import {render} from 'react-dom';
  import $ from 'jquery';
  
  import App from './component/App.js';
  
  render(<App />, $('#app')[0]);
  
  
  $(document).ready(function() {
  
      // prevent the default action for button class
      $('.btn').on('click', (e) => {
          e.preventDefault();
      })
  
  });
  