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