您可以在最顶层组件的componentDidMount中的窗口上添加keydown侦听器。

• • 示例**

class App extends React.Component {
  state = { lastPressedKey: null };

  componentDidMount() {
    window.addEventListener("keydown", this.handleKeyPress);
  }

  componentWillUnmount() {
    window.removeEventListener("keydown", this.handleKeyPress);
  }

  handleKeyPress = event => {
    this.setState({ lastPressedKey: event.key });
  };

  render() {
    return <div>Key last pressed: {this.state.lastPressedKey}</div>;
  }
}

ReactDOM.render(<App />, document.getElementById("root"));

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<div id="root"></div>

这将与Tholle答案示例相同，但使用React Hooks。

import {useState, useEffect} from 'react';

function App(){
    
  const [lastPressedKey, setLastPressedKey] = useState(null);
  
  const handleKeyPress = (event) => setLastPressedKey(event.key);
  
  useEffect(() => {
    window.addEventListener("keydown", handleKeyPress);
    
    return () => window.removeEventListener("keydown", handleKeyPress);
  }, []);

    return <div>Key last pressed: {lastPressedKey}</div>
}