React 报错 ‘root‘ is not defined no-undef

src\index.js
  Line 9:1:  'root' is not defined  no-undef

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ERROR in src\index.js
  Line 9:1:  'root' is not defined  no-undef

Search for the keywords to learn more about each error.

webpack compiled with 1

import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import App from './App';



// ReactDOM.createRoot(document.getElementById('root'));
// root.render(
//   <React.StrictMode>
//     <App />
//   </React.StrictMode>
// );
改为
ReactDOM.render(<App />,document.getElementById('root'));