JAVASCRIPT 来实现:当我在下拉列表中选择了第几周(如20)后,立刻显示该周的星期一到星期日的日期(如:3月10 到 3月17)?

Question

有现成的代码吗?谢谢了..

Answer 1

new一个本年的第一天，然后判断它是星期几，设为x，然后加上20*7-x天就是20周的星期一了

Answer 2

DateTime firstDayOfCurrentYear = new DateTime(2009, 1, 1);
            firstDayOfCurrentYear = firstDayOfCurrentYear.AddDays(5 * 7);
            DateTime firstDayOfWeek = firstDayOfCurrentYear.AddDays(DayOfWeek.Sunday - firstDayOfCurrentYear.DayOfWeek  );
            DateTime endDayOfWeek = firstDayOfWeek.AddDays(6);

Answer 3

如果星期一算每周第一天的话
DateTime firstDayOfCurrentYear = new DateTime(2009, 1, 1);
            firstDayOfCurrentYear = firstDayOfCurrentYear.AddDays(5 * 7);
            DateTime firstDayOfWeek = firstDayOfCurrentYear.AddDays(DayOfWeek.Monday - firstDayOfCurrentYear.DayOfWeek  );
            DateTime endDayOfWeek = firstDayOfWeek.AddDays(6);