ReactNative 退出到后台一定时间之后，跳转到登录界面

****实现长时间不操作应用，可以自定义多长时间，直接跳转到登录界面，登录之后才能再进行操作****
let pTimes;
let BACK_TO_LOGIN_TIME = 120；
constructor(props) {
super(props);
this.state={
currentAppState:AppState.currentState,
}
}

componentDidMount() {
AppState.addEventListener('change', this.handleAppStateChange);
pTimes =-1;
}

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

handleAppStateChange = (nextAppState) => {
if (this.state.currentAppState.match(/inactive|background/) && nextAppState === 'active') {
let tempTime = getCurrentTime();
let waste = tempTime -pTimes;
console.log('----'+preTimes+'----waste:' + waste)
console.log('BACK_TO_LOGIN_TIME====='+BACK_TO_LOGIN_TIME)
if (waste > BACK_TO_LOGIN_TIME) {
InteractionManager.runAfterInteractions(()=>{
this.props.navigator.resetTo({
component:Login,
name:'Login',
})
})
toastShort('长时间未操作，需要重新登录')
console.log('AppState：'+'It's too late,login again')
}else{
console.log('AppState：'+'回来的很及时')
}
console.log('AppState:'+'现在在前台')
}else{
//前台切换至后台
console.log('AppState:'+'现在在后台')
preTimes = getCurrentTime();
}
this.setState({ currentAppState:nextAppState});
console.log('pTimes：'+pTimes);
}

//返回从1970年1月1日至今的毫秒数
export function getCurrentTime(){
let date = new Date();
return date.getTime();

}