js获取当周、月、季日期

待优化

getDay(type, date){
 if (!date || !type) return;
  let list = [];
  const presentDate = new Date(date),
    presentYear = presentDate.getFullYear(),
    presentMonth = presentDate.getMonth() + 1;
//获取月日期
  if (type === "month") {
    list = getMonthDate(presentYear, presentMonth);
  }
//获取季度日期
  if (type === "quarter") {
    // 当前季度
    const currQuarter = Math.floor(
      presentMonth % 3 == 0 ? presentMonth / 3 : presentMonth / 3 + 1
    );
    const startMon = (currQuarter - 1) * 3 + 1; //季度月份
    for (let mon = startMon; mon <= startMon + 2; mon++) {
      list = [...list, ...getMonthDate(presentYear, mon)];
    }
  }
//获取周日期
  if (type === "week") {
    let today = presentDate.getDay() !== 0 ? presentDate.getDay() : 7;
    list = Array.from(new Array(7), function(val, index) {
      return formatDate(
        new Date(
          presentDate.getTime() - (today - index - 1) * 24 * 60 * 60 * 1000
        )
      );
    });
  }
//获取当月的日期集合
  function getMonthDate(year, month) {
    const totalDay = getTotal(year, month);
    //方法一：循环直接拼接输出
    //const list = []
    //for(let i = 1;  i<= totalDay; i++){
    //  list.push(`${year}-${month}-${i}`)
    //}
    //return list
  //方式二：日期计算 再格式化输出
    return Array.from(new Array(totalDay), function(val, index) {
      return formatDate(
        new Date(
          new Date(year, month - 1, 1).getTime() + index * 24 * 60 * 60 * 1000
        )
      );
    });
  }
  return list;
  function getTotal(year, month) {
    return new Date(year, month, 0).getDate();
  }
  function formatDate(date) {
    return (
      date.getFullYear() + "-" + (date.getMonth() + 1) + "-" + date.getDate()
    );
  }
};

getDay("month", "2019.3.5")

image.png

type: month(月)/quarter(季)/week(周)
date：当前日期(日期格式)