You need to import ReactDOM in Main.js instead of App.jsx , as Main is where you are using ReactDOM to render. Also need to import React in ... ... <看更多>

code i used : import ReactDOM from 'react-dom'; import React from 'react'; const App= () =>( Hello first React project ) ReactDOM.render( ... ... <看更多>

Topic :-------- ' ReactDOM' is not defined no-undef | Compiled with problems | ReactJS | Aryadrj -------------------------------------You can ... ... <看更多>