js处理日期，今天，昨天，本周，上周，上个月，本月的开始日期和结束日期的时间戳

 // tab点击
      const  handleTabItem = function (value) {
            $scope.activeMenu = value;
            let d = new Date();
            let startDate = null;
            let endDate = null;
            if (value === '全部') {
                startDate = null;
                endDate = null;
            } else if (value === '今天') {
                startDate = new Date(new Date().toLocaleDateString()).getTime();
                endDate = new Date(new Date().toLocaleDateString()).getTime() + 24 * 60 * 60 * 1000 - 1;
            } else if (value === '昨天') {
                d.setDate(d.getDate() - 1);
                startDate = new Date(d.toLocaleDateString()).getTime()
                endDate = new Date(d.toLocaleDateString()).getTime() + 24 * 60 * 60 * 1000 - 1;
            } else if (value === '本周') {
                let week = d.getDay();//返回date是一周中的某一天
                let millisecond = 1000 * 60 * 60 * 24;  //一天的毫秒数
                let minusDay = week != 0 ? week - 1 : 6; //减去的天数  
                startDate = new Date(new Date(d.getTime() - (minusDay * millisecond)).setHours(0, 0, 0, 0)).getTime(); //本周 周一 0:00          
                endDate = new Date(new Date(startDate + 6 * millisecond).setHours(0, 0, 0, 0)).getTime() + 86399999;//本周 周日 23:59    　　　
            } else if (value === '上周') {
                let week = d.getDay();//返回date是一周中的某一天
                let millisecond = 1000 * 60 * 60 * 24;  //一天的毫秒数
                let minusDay = week != 0 ? week - 1 : 6; //减去的天数  
                let currentWeekDayOne = new Date(d.getTime() - (millisecond * minusDay)); //获得当前周的第一天    
                endDate = new Date(new Date(currentWeekDayOne.getTime() - millisecond).setHours(0, 0, 0, 0)).getTime() + 86399999; //上周最后一天即本周开始的前一天 0:00   
                startDate = new Date(new Date(endDate - (millisecond * 6)).setHours(0, 0, 0, 0)).getTime(); //上周的第一天 23:59    

            } else if (value === '本月') {
                let currentMonth = d.getMonth();//获得当前月份0-11 
                let currentYear = d.getFullYear();//获得当前年份4位年 
                startDate = new Date(new Date(currentYear, currentMonth, 1).setHours(0, 0, 0, 0)).getTime();//求出本月第一天    
                if (currentMonth == 11) {//当为12月的时候年份需要加1 月份需要更新为0 也就是下一年的第一个月     
                    currentYear++;
                    currentMonth = 0;//就为0    
                } else {//否则只是月份增加,以便求的下一月的第一天      8080
                    currentMonth++;
                }
                let millisecond = 1000 * 60 * 60 * 24;//一天的毫秒数   
                let nextMonthDayOne = new Date(currentYear, currentMonth, 1); //下月的第一天    
                endDate = new Date(new Date(nextMonthDayOne.getTime() - millisecond).setHours(0, 0, 0, 0)).getTime() + 86399999;//求出上月的最后一天    
            } else if (value === '上月') {
                var obj = getLastMonthStartDate();
                startDate = new Date(obj.startDate).getTime();
                endDate = new Date(obj.endDate).getTime();
            }
         
            // startDate = new Date(startDate)
            // endDate = new Date(endDate)
            // console.log(startDate, endDate);
        

        }

 //获得上月开始和结束时间
        function getLastMonthStartDate() {
            var nowdays = new Date();
            var year = nowdays.getFullYear();
            var month = nowdays.getMonth();
            if (month == 0) {
                month = 12;
                year = year - 1;
            }
            if (month < 10) {
                month = '0' + month;
            }
            var myDate = new Date(year, month, 0);
            var startDate = year + '-' + month + '-01 00:00:00'; //上个月第一天
            var endDate = year + '-' + month + '-' + myDate.getDate() + ' 23:59:00';//上个月最后一天
            var objtime = { startDate: startDate, endDate: endDate }
            return objtime;
        };