react笔记之学习之使用create-react-app创建文件

import React from 'react';
const App = () => {
    return (
        <div>
            我是App
        </div>
    );
};
export default App;

import React from 'react';
import ReactDOM from 'react-dom/client';
import App from "./App";
const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(
  <React.StrictMode>
    <App/>
  </React.StrictMode>
);