js获取某个月的星期每周的集合

先看返回的数据格式

 

 

//获取某个月的星期每周的集合，date所在的月份的
function getWeeksInMonth(date) {
  let year = date.getFullYear()
  let month = date.getMonth() + 1;
  const firstDayOfMonth = new Date(year, month - 1, 1);
  const lastDayOfMonth = new Date(year, month, 0);
  const weeks = [];
  const currentDay = new Date(firstDayOfMonth);
  let weekNumber = 0;
  const weekNumberCn = ["一", "二", "三", "四", "五", "六"]; // 最多六周
  let isEnd = true;
  while (isEnd) {
    const startOfWeek = new Date(currentDay);
    const endOfWeek = new Date(currentDay);
    // 获取本周的开始日期（周一）
    startOfWeek.setDate(currentDay.getDate() - currentDay.getDay() + (currentDay.getDay() === 0 ? -5 : 2));
    // 获取本周的结束日期（周日）
    endOfWeek.setDate(currentDay.getDate() - currentDay.getDay() + (currentDay.getDay() === 0 ? 1 : 8));
    let list = []//本周的日期集合
    const current = new Date(startOfWeek);
    while (current <= endOfWeek) {
      list.push(new Date(current).toISOString().slice(0, 10));
      current.setDate(current.getDate() + 1);
    }
    weeks.push({
      weekNumber: "第" + weekNumberCn[weekNumber] + "周",
      start: startOfWeek.toISOString().slice(0, 10),
      end: endOfWeek.toISOString().slice(0, 10),
      list: list,
    });
    weekNumber++;
    if (endOfWeek <= lastDayOfMonth) {
      currentDay.setDate(currentDay.getDate() + 7);
    } else {
      isEnd = false;
    }
  }
  return weeks;
}