js 统计日期区间内的每个星期的天数开始日期38831结束日期39021星期日的个数=INT((WEEKDAY($B$1-0,2)+$B$2-$B$1)7)星期一的个数=INT((WEEKDAY($B$1-1,2)+$B$2-$B$1)7)星期二的个数=INT((WEEK2023-04-21JavaScript270