按月-年和周-年Javascript对数组进行排序

// 假设我们有一个日期对象数组
const dates = [
  new Date(2022, 11, 15), // December 15, 2022
  new Date(2023, 0, 1),   // January 1, 2023
  new Date(2022, 5, 30),  // June 30, 2022
  new Date(2023, 0, 8)    // January 8, 2023
];

// 按月-年排序
dates.sort((a, b) => {
  if (a.getFullYear() === b.getFullYear()) {
    return a.getMonth() - b.getMonth();
  }
  return a.getFullYear() - b.getFullYear();
});

console.log("按月-年排序:", dates);

// 按周-年排序
dates.sort((a, b) => {
  const weekA = getWeekNumber(a);
  const weekB = getWeekNumber(b);
  if (weekA.week === weekB.week) {
    return a.getFullYear() - b.getFullYear();
  }
  return weekA.week - weekB.week;
});

console.log("按周-年排序:", dates);

// 辅助函数：获取日期所在的周数
function getWeekNumber(date) {
  const d = new Date(Date.UTC(date.getFullYear(), date.getMonth(), date.getDate()));
  const dayNum = d.getUTCDay() || 7;
  d.setUTCDate(d.getUTCDate() + 4 - dayNum);
  const yearStart = new Date(Date.UTC(d.getUTCFullYear(), 0, 1));
  return {
    week: Math.ceil((((d - yearStart) / 86400000) + 1) / 7),
    year: d.getUTCFullYear()
  };
}