js返回本周第一天的时间，返回本周最后一天的时间

WeekFirstDay 返回本周第一天的时间

/***
 * 本周第一天
 *  @return {*} WeekFirstDay 返回本周第一天的时间
 */
function showWeekFirstDay(){
    let Nowdate=new Date();
    let WeekFirstDay=new Date(Nowdate-(Nowdate.getDay()-1)*86400000);
    return WeekFirstDay;
}

WeekLastDay 返回本周最后一天的时间

/***
 * 本周最后一天
 *  @return {*} WeekLastDay 返回本周最后一天的时间
 */
function showWeekLastDay(){
    let Nowdate=new Date();
    let WeekFirstDay=new Date(Nowdate-(Nowdate.getDay()-1)*86400000);
    let WeekLastDay=new Date((WeekFirstDay/1000+6*86400)*1000);
    return WeekLastDay;
}