npx create-react-app react-nodejs-demo
cd react-nodejs-demo
npm start

输出结果

Compiled successfully!

You can now view react-nodejs-demo in the browser.

Local: http://localhost:3000 On Your Network: http://192.168.1.6:3000

Note that the development build is not optimized. To create a production build, use npm run build.

webpack compiled successfully

访问http://localhost:3000,效果如下