如何在react-native中计算appState后台时间和appState前台(活动)状态时间？

import { AppState, Platform } from 'react-native';

class YourComponent extends Component {
  constructor(props) {
    super(props);
    this.state = {
      appState: AppState.currentState,
      startTime: new Date(),
      appStateTime: 0,
    };
  }

  componentDidMount() {
    AppState.addEventListener('change', this.handleAppStateChange);
  }

  componentWillUnmount() {
    AppState.removeEventListener('change', this.handleAppStateChange);
  }

  handleAppStateChange = (nextAppState) => {
    const { appState, startTime, appStateTime } = this.state;
    if (appState.match(/inactive|background/) && nextAppState === 'active') {
      // 应用从后台返回前台，计算后台时间
      const endTime = new Date();
      const timeDifference = endTime - startTime;
      this.setState({
        startTime: endTime,
        appStateTime: appStateTime + timeDifference,
      });
    } else if (appState === 'active' && nextAppState.match(/inactive|background/)) {
      // 应用从前台进入后台，更新当前状态
      this.setState({ appState: nextAppState });
    }
  };

  // 其他组件代码...

}

render() {
  const { appStateTime } = this.state;
  // 将appStateTime格式化为小时、分钟、秒等形式
  const formattedTime = formatTime(appStateTime);
  return (
    <View>
      <Text>应用在后台的总时间：{formattedTime}</Text>
    </View>
  );
}