如何在应用程序处于后台时保持后台计时器在react原生中运行

npm install react-native-background-timer --save

import { AppState } from 'react-native';
import BackgroundTimer from 'react-native-background-timer';

constructor(props) {
  super(props);
  this.state = {
    timer: null,
    appState: AppState.currentState,
  };
  this.handleAppStateChange = this.handleAppStateChange.bind(this);
}

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

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

handleAppStateChange(nextAppState) {
  if (
    this.state.appState.match(/inactive|background/) &&
    nextAppState === 'active'
  ) {
    // 应用程序从后台返回前台，启动计时器
    const timer = BackgroundTimer.setInterval(() => {
      // 执行计时器操作
    }, 1000);
    this.setState({ timer });
  } else if (
    this.state.appState === 'active' &&
    nextAppState.match(/inactive|background/)
  ) {
    // 应用程序进入后台，停止计时器
    BackgroundTimer.clearInterval(this.state.timer);
    this.setState({ timer: null });
  }
  this.setState({ appState: nextAppState });
}