text: import React from 'react'
  import ReactDOM from 'react-dom'
  import { BrowserRouter } from 'react-router-dom'
  import Demo from './Demo'
  
  ReactDOM.render((
     <BrowserRouter>
        <Demo />
     </BrowserRouter>
  ), document.getElementById('container'))
  
  if (module.hot) {
     module.hot.accept()
  }
  