获取月份的自然周

   //获取当前月有几周
   getWeeks(year, month) {
      var d = new Date();
      // 该月第一天
      d.setFullYear(year, month - 1, 1);
      var w1 = d.getDay();
      if (w1 == 0) w1 = 7;
      // 该月天数
      d.setFullYear(year, month, 0);
      var dd = d.getDate();
      // 第一个周一
      let d1;
      if (w1 != 1) d1 = 7 - w1 + 2;
      else d1 = 1;
      let week_count = Math.ceil((dd - d1 + 1) / 7);
      return week_count;
   },
   //根据年月周获取该周从周一到周日的日期
   getWeekTime(year, month, weekday, timeArr) {
      var d = new Date();
      // 该月第一天
      d.setFullYear(year, month - 1, 1);
      var w1 = d.getDay();
      if (w1 == 0) w1 = 7;
      // 该月天数
      d.setFullYear(year, month, 0);
      var dd = d.getDate();
      // 第一个周一
      let d1;
      if (w1 != 1) d1 = 7 - w1 + 2;
      else d1 = 1;
      var monday = d1 + (weekday - 1) * 7;
      var sunday = monday + 6;
      var from = year + "-" + month + "-" + monday;
      var to;
      if (sunday <= dd) {
         to = year + "-" + month + "-" + sunday;
      } else {
         d.setFullYear(year, month - 1, sunday);
         let days = d.getDate();
         to = d.getFullYear() + "-" + (d.getMonth() + 1) + "-" + days;
      }
      if (timeArr) {
         return from + '~' + to
      }
      return '第' + weekday + '周：' + from + '~' + to
   }

var weekNUm =_t.getWeeks(2022, 12)；
   for (var k = 1; k <= weekNUm; k++) {
       _t.getWeekTime(todayYear, todayMonent, k);
      }