useEffect 与生命周期

componentDidMount() {

 AppState.addEventListener("change", this._handleAppStateChange);

 }

 componentWillUnmount() {

 AppState.removeEventListener("change", this._handleAppStateChange);

 }

useEffect(() => {

 AppState.addEventListener("change", _handleAppStateChange);

 return () => {

 AppState.removeEventListener("change", _handleAppStateChange);

 };

 }, []);