js 獲取本週、上週、本月、上月方法

  1 /**
  2  * Created by Administrator on 2015/12/11.
  3  */
  4 dateRange = {
  5     currentDate: new Date(),
  6     millisecond: 1000 * 60 * 60 * 24,//一天的毫秒數
  7     getThisWeek: function() {
  8         //起止日期數組
  9         var startStop = new Array();
 10         //返回date是一週中的某一天
 11         var week = dateRange.currentDate.getDay();
 12         //減去的天數
 13         var minusDay = week != 0 ? week - 1 : 6;
 14         //本週 週一
 15         var monday = new Date(dateRange.currentDate.getTime() - (minusDay * dateRange.millisecond));
 16         //本週 週日
 17         var sunday = new Date(monday.getTime() + (6 * dateRange.millisecond));
 18         //添加本週時間
 19         startStop.push(dateRange.formatterDate(monday)); //本週起始時間
 20         //添加本週最後一天時間
 21         startStop.push(dateRange.formatterDate(sunday)); //本週終止時間
 22         //返回
 23         return startStop;
 24     },
 25     /**
 26      * 得到上一週的起止日期
 27      */
 28     getLastWeek: function() {
 29         //起止日期數組
 30         var startStop = new Array();
 31         //返回date是一週中的某一天
 32         var week = dateRange.currentDate.getDay();
 33         //減去的天數
 34         var minusDay = week != 0 ? week - 1 : 6;
 35         //得到當前周的第一天
 36         var currentWeekDayOne = new Date(dateRange.currentDate.getTime() - (dateRange.millisecond * minusDay));
 37         //上週最後一天即本週開始的前一天
 38         var priorWeekLastDay = new Date(currentWeekDayOne.getTime() - dateRange.millisecond);
 39         //上週的第一天
 40         var priorWeekFirstDay = new Date(priorWeekLastDay.getTime() - (dateRange.millisecond * 6));
 41 
 42         startStop.push(dateRange.formatterDate(priorWeekFirstDay));
 43         startStop.push(dateRange.formatterDate(priorWeekLastDay));
 44         //返回
 45         return startStop;
 46     },
 47     /**
 48      * 得到這個月的起止日期
 49      */
 50     getThisMonth: function() {
 51         var startStop = new Array();
 52         //得到當前月份0-11
 53         var currentMonth = dateRange.currentDate.getMonth();
 54         //得到當前年份4位年
 55         var currentYear = dateRange.currentDate.getFullYear();
 56         //求出本月第一天
 57         var firstDay = new Date(currentYear, currentMonth, 1);
 58         //當爲12月的時候年份須要加1
 59         //月份須要更新爲0 也就是下一年的第一個月
 60         //不然只是月份增長,以便求的下一月的第一天
 61         if (currentMonth == 11) {
 62             currentYear++;
 63             currentMonth = 0;
 64         } else {
 65             currentMonth++;
 66         }
 67         //下月的第一天
 68         var nextMonthDayOne = new Date(currentYear, currentMonth, 1);
 69         //求出上月的最後一天
 70         var lastDay = new Date(nextMonthDayOne.getTime() - dateRange.millisecond);
 71 
 72         startStop.push(dateRange.formatterDate(firstDay));
 73         startStop.push(dateRange.formatterDate(lastDay));
 74         //返回
 75         return startStop;
 76     },
 77     /**
 78      * 得到上個月的起止日期
 79      */
 80     getLastMonth: function() {
 81         var startStop = new Array();
 82         //得到當前月份0-11
 83         var currentMonth = dateRange.currentDate.getMonth();
 84         //得到當前年份4位年
 85         var currentYear = dateRange.currentDate.getFullYear();
 86         var currentDay = new Date(currentYear, currentMonth, 1);
 87         //上個月的第一天
 88         //年份爲0表明,是本年的第一月,因此不能減
 89         if (currentMonth == 0) {
 90             currentMonth = 11; //月份爲上年的最後月份
 91             currentYear--; //年份減1
 92         }
 93         else {
 94             currentMonth--;
 95         }
 96         var firstDay =  new Date(currentYear, currentMonth, 1);
 97         //求出上月的最後一天
 98         var lastDay = new Date(currentDay.getTime() - dateRange.millisecond);
 99 
100         startStop.push(dateRange.formatterDate(firstDay));
101         startStop.push(dateRange.formatterDate(lastDay));
102         //返回
103         return startStop;
104     },
105     /**
106      * 格式化日期（不含時間）
107      */
108     formatterDate : function(date) {
109         var datetime = date.getFullYear()
110             + "-"// "年"
111             + ((date.getMonth() + 1) > 10 ? (date.getMonth() + 1) : "0"
112             + (date.getMonth() + 1))
113             + "-"// "月"
114             + (date.getDate() < 10 ? "0" + date.getDate() : date
115                 .getDate());
116         return datetime;
117     }
118 }