JavaScript 得到上周时间范围，本月时间范围

//1.  得到本月一号为开始时间，得到当前时间减两天为结束时间function SetDayDate() {//当前时间减两天var dataValue = new Date(new Date().getTime() - (1000 * 60 * 60 * 48));    //（1000*60*60*24）是1千毫秒（是1秒）乘60（是1分）乘60（是1小时）*24（是一天）加减一天把前边的-+换一下就行。var year = dataValue.getFullYear();var month = dataValue.getMonth() + 1;var day = dataValue.getDate();if (month < 10) {month = '0' + month;}if (day < 10) {if (day < 1) {day = '01';} else {day = '0' + day;}}var stime = year + '/' + month + '/' + '01';  //开始时间var etime = year + '/' + month + '/' + day;   //结束时间}   //2.  得到当前时间的上周时间范围function SetWeekDate() {var dataValue = new Date();var year = dataValue.getFullYear();var month = dataValue.getMonth() + 1;var day = dataValue.getDate();var thisWeekStart; //本周周一的时间if (dataValue.getDay() == 0) {  //周天的情况；thisWeekStart = (new Date(year + '/' + month + '/' + day)).getTime() - ((dataValue.getDay()) + 6) * 86400000;} else {thisWeekStart = (new Date(year + '/' + month + '/' + day)).getTime() - ((dataValue.getDay()) - 1) * 86400000;}//获得上周时间var prevWeekStart = thisWeekStart - 7 * 86400000;//上周周一的时间var prevWeekEnd = thisWeekStart - 1 * 86400000;//上周周日的时间var stime = formatDate(new Date(prevWeekStart)); //开始时间var etime = formatDate(new Date(prevWeekEnd));   //结束时间}//3.  得到当前时间的上月时间范围function SetMonthDate() {var dataValue = new Date()；var currentYear = dataValue.getFullYear();var currentMonth = dataValue.getMonth();var prevCurrentYear = 0, prevCurrentMonth = 0;if (currentMonth == 0) {prevCurrentYear = currentYear - 1;prevCurrentMonth = 12;} else {prevCurrentYear = currentYear;prevCurrentMonth = currentMonth - 1;}var prevmonthLastday = (new Date(currentYear, currentMonth, 1)).getTime() - 86400000;var stime = formatDate(new Date(prevCurrentYear, prevCurrentMonth, 1));  //开始时间var etime = formatDate(new Date(prevmonthLastday));                      //结束时间}//格式化日期：yyyy/MM/ddfunction formatDate(date) {var myyear = date.getFullYear();var mymonth = date.getMonth() + 1;var myweekday = date.getDate();if (mymonth < 10) {mymonth = "0" + mymonth;}if (myweekday < 10) {myweekday = "0" + myweekday;}return (myyear + "/" + mymonth + "/" + myweekday);}