周计划获取周日历

根据windows日历，获取当前周，以及当前周的前2周和后4周，共7周的日期范围

export function getFormatDate(serverDate) {
  let list = [] // 二维数组
  let formatDate = function (date, days) {
    let year = date.getFullYear()
    let month = date.getMonth() + 1
    let day = date.getDate()
    month = month < 10 ? '0' + month : month
    day = day < 10 ? '0' + day : day
    // let week = day === 7 ? 1 : parseInt(day / 7) + 1
    return days + year + '.' + month + '.' + day
  }
  let getFormatDay = function (date) {
    let month = date.getMonth() + 1
    month = month < 10 ? '0' + month : month
    let day = date.getDate()
    let week = day === 7 ? 1 : parseInt(day / 7) + 1
    return `${month}月第${week}周`
  }
  let addDate = function (date, n) {
    date.setDate(date.getDate() + n)
    return date
  }
  let setDate = function (date) {
    let week = date.getDay() === 0 ? 6 : date.getDay() - 1
    date = addDate(date, week * -1)
    let arr = []
    let day = getFormatDay(date)
    for (let i = 0; i < 7; i++) {
      arr.push(formatDate(i === 0 ? addDate(date, 0) : addDate(date, 1), day))
    }
    // console.log(arr);
    list.push(arr)
  }
  let algo = [-2, -1, 0, 1, 2, 3, 4]
  for (let i = 0; i < algo.length; i++) {
    setDate(
      addDate(serverDate ? new Date(serverDate) : new Date(), algo[i] * 7)
    )
  }
  // 处理成需要的结果
  let result = []
  list.forEach((item) => {
    item =
      item[0] +
      '-' +
      item[item.length - 1].substring(
        item[item.length - 1].length - 10,
        item[item.length - 1].length
      )
    result.push(item)
  })
  return result
}

结果：