npm install react-device-detect --save
# or
yarn add react-device-detect --save

import { BrowserView, MobileView } from "react-device-detect";

function App() {
  return (
    <BrowserView renderWithFragment>
      <div>浏览器端</div>
    </BrowserView>
    <MobileView renderWithFragment>
      <div>手机端</div>
    </MobileView>
  );
}

export default App;

import { isMobile } from 'react-device-detect';

function App() {
  renderContent = () => {
    if (isMobile) {
      return <div> This content is available only on mobile</div>
    }
    return <div> ...content </div>
  }

  render() {
    return this.renderContent();
  }
}