JS根据选中日期获取当前周的周一和周日日期

1、根据当前日期演示

var now =new Date();
            var nowTime =now.getTime();
            var day =now.getDay();
            var oneDayTime =24*60*60*1000;

            //显示周一
            var MondayTime =nowTime - (day-1)*oneDayTime;
            //显示周日
            var SundayTime = nowTime +(7-day)*oneDayTime;

            //初始化日期时间
            var monday =new Date(MondayTime);
            var sunday = new Date(SundayTime);

            //打印查看结果
            alert(monday);
            alert(sunday);

2、js根据日期的方法获取当前这一周的周一（或者周日）

//获取当前日期周一
function getFirstDayOfWeek(date){
    var day =date.getDay()||7;
    return new Date(date.getFullYear(),date.getMonth(),date.getDate()+1-day);
};
//获取当前日期周日
function getLastDayOfWeek (date) {
    var day = date.getDay() || 7;
    return new Date(date.getFullYear(), date.getMonth(), date.getDate()+7 - day);
};