js获取近一周，近一个月，近三个月时间

js获取近一周，近一个月，近三个月时间

// 获取进一周时间
export function getAWeek() {
  let end = new Date()
  let year = end.getFullYear()
  let month = end.getMonth() + 1 //0-11表示1-12月
  let day = end.getDate()
  let dateObj = {}
  // dateObj.end = year + '-' + month + '-' + day
  dateObj.end =
    year +
    '-' +
    (month >= 1 && month <= 9 ? '0' : '') +
    month +
    '-' +
    (day >= 0 && day <= 9 ? '0' : '') +
    day
  if (day - 7 <= 0) {
    //如果在当月7日之前
    let startMonthDay = new Date(year, parseInt(month) - 1, 0).getDate() //1周前所在月的总天数
    if (month - 1 <= 0) {
      //如果在当年的1月份
      dateObj.start = year - 1 + '-' + 12 + '-' + (31 - (7 - day))
    } else {
      dateObj.start =
        year +
        '-' +
        (month - 1 >= 1 && month - 1 <= 9 ? '0' : '') +
        (month - 1) +
        '-' +
        (startMonthDay - (7 - day) >= 0 && startMonthDay - (7 - day) <= 9
          ? '0'
          : '') +
        (startMonthDay - (7 - day))
    }
  } else {
    dateObj.start =
      year +
      '-' +
      (month >= 1 && month <= 9 ? '0' : '') +
      month +
      '-' +
      (day - 7 >= 0 && day - 7 <= 9 ? '0' : '') +
      (day - 7)
  }
  return dateObj
}
// 获取进一个月时间
export function getAMonth() {
  let end = new Date()
  let year = end.getFullYear()
  let month = end.getMonth() + 1 //0-11表示1-12月
  let day = end.getDate()
  let dateObj = {}
  // dateObj.end = year + '-' + month + '-' + day
  dateObj.end =
    year +
    '-' +
    (month >= 1 && month <= 9 ? '0' : '') +
    month +
    '-' +
    (day >= 0 && day <= 9 ? '0' : '') +
    day
  let endMonthDay = new Date(year, month, 0).getDate() //当前月的总天数
  if (month - 1 <= 0) {
    //如果是1月，年数往前推一年
    dateObj.start =
      year - 1 + '-' + 12 + '-' + (day >= 0 && day <= 9 ? '0' : '') + day
  } else {
    let startMonthDay = new Date(year, parseInt(month) - 1, 0).getDate()
    if (startMonthDay < day) {
      //1个月前所在月的总天数小于现在的天日期
      if (day < endMonthDay) {
        //当前天日期小于当前月总天数
        //
        dateObj.start =
          year +
          '-' +
          (month - 1 >= 1 && month - 1 <= 9 ? '0' : '') +
          (month - 1) +
          '-' +
          (startMonthDay - (endMonthDay - day) >= 1 &&
          startMonthDay - (endMonthDay - day) <= 9
            ? '0'
            : '') +
          (startMonthDay - (endMonthDay - day))
      } else {
        dateObj.start =
          year +
          '-' +
          (month - 1 >= 1 && month - 1 <= 9 ? '0' : '') +
          (month - 1) +
          '-' +
          (startMonthDay >= 0 && startMonthDay <= 9 ? '0' : '') +
          startMonthDay
      }
    } else {
      dateObj.start =
        year +
        '-' +
        (month - 1 >= 1 && month - 1 <= 9 ? '0' : '') +
        (month - 1) +
        '-' +
        (day >= 0 && day <= 9 ? '0' : '') +
        day
    }
  }
  return dateObj
}
// 获取进三个月
export function getThrMonth() {
  let end = new Date()
  let year = end.getFullYear()
  let month = end.getMonth() + 1 //0-11表示1-12月
  let day = end.getDate()
  let dateObj = {}
  // dateObj.end = year + '-' + month + '-' + day
  dateObj.end =
    year +
    '-' +
    (month >= 1 && month <= 9 ? '0' : '') +
    month +
    '-' +
    (day >= 0 && day <= 9 ? '0' : '') +
    day
  let endMonthDay = new Date(year, month, 0).getDate() //当前月的总天数
  if (month - 3 <= 0) {
    //如果是1、2、3月，年数往前推一年
    let start3MonthDay = new Date(
      year - 1,
      12 - (3 - parseInt(month)),
      0
    ).getDate() //3个月前所在月的总天数
    if (start3MonthDay < day) {
      //3个月前所在月的总天数小于现在的天日期
      dateObj.start =
        year -
        1 +
        '-' +
        (12 - (3 - month) >= 1 && 12 - (3 - month) <= 9 ? '0' : '') +
        (12 - (3 - month)) +
        '-' +
        (start3MonthDay >= 0 && start3MonthDay <= 9 ? '0' : '') +
        start3MonthDay
    } else {
      dateObj.start =
        year -
        1 +
        '-' +
        (12 - (3 - month) >= 1 && 12 - (3 - month) <= 9 ? '0' : '') +
        (12 - (3 - month)) +
        '-' +
        (day >= 0 && day <= 9 ? '0' : '') +
        day
    }
  } else {
    let start3MonthDays = new Date(year, parseInt(month) - 3, 0).getDate() //3个月前所在月的总天数
    if (start3MonthDays < day) {
      //3个月前所在月的总天数小于现在的天日期
      if (day < endMonthDay) {
        //当前天日期小于当前月总天数,2月份比较特殊的月份
        //
        dateObj.start =
          year +
          '-' +
          (month - 3 >= 1 && month - 3 <= 9 ? '0' : '') +
          (month - 3) +
          '-' +
          (start3MonthDays - (endMonthDay - day) >= 0 &&
          start3MonthDays - (endMonthDay - day) <= 9
            ? '0'
            : '') +
          (start3MonthDays - (endMonthDay - day))
      } else {
        dateObj.start =
          year +
          '-' +
          (month - 3 >= 1 && month - 3 <= 9 ? '0' : '') +
          (month - 3) +
          '-' +
          (start3MonthDays >= 0 && start3MonthDays <= 9 ? '0' : '') +
          start3MonthDays
      }
    } else {
      dateObj.start =
        year +
        '-' +
        (month - 3 >= 1 && month - 3 <= 9 ? '0' : '') +
        (month - 3) +
        '-' +
        (day >= 0 && day <= 9 ? '0' : '') +
        day
    }
  }
  return dateObj
}