import {Home} from './containers'
import React from 'react'
import {render} from 'react-dom'

render(<Home />,gitdocument.querySelector('#app'))

import {Home} from './containers'
import React from 'react'
import {render} from 'react-dom'

let b = 5;
const f1 = ()=> {};
render(<Home />,gitdocument.querySelector('#app'))

Update index.js