01-class组件.js
import React from 'react'
class App extends React.Component{
render(){
return <div>hello react Component</div>
}
}
export default App;
index.js
import React from 'react'
import ReactDOM from 'react-dom'
import App from './01-base/01-class组件'
ReactDOM.render(
<App></App>,
document.getElementById('root')
)
效果
