function getWeeks(year = 2022) {
  // 一年第一天是周几
  var first = new Date(year, 0, 1).getDay()
  if (first == 1) {
    first = 0
  } else if (first == 0) {
    first = 1
  } else {
    first = 8 - first
  }
  // 计算一年有多少天
  if ((year % 4 == 0 && year % 100 != 0) || (year % 100 == 0 && year % 400 == 0)) {
    var allyears = 366
  } else {
    var allyears = 365
  }
  // 计算一年有多少周
  var week = Math.ceil((allyears - first) / 7) + (first !== 0 ? 1 : 0)
  return week
}