在使用Javascript确定两个日期之间的差异时，如何将闰年考虑在内？

function getDaysBetweenDates(startDate, endDate) {
  // 获取起始日期和结束日期的年份和月份
  var startYear = startDate.getFullYear();
  var endYear = endDate.getFullYear();
  var startMonth = startDate.getMonth();
  var endMonth = endDate.getMonth();

  // 计算年份差
  var yearDiff = endYear - startYear;

  // 计算月份差
  var monthDiff = endMonth - startMonth;

  // 处理跨年的情况
  if (monthDiff < 0) {
    yearDiff--;
    monthDiff += 12;
  }

  // 计算天数差
  var startDay = startDate.getDate();
  var endDay = endDate.getDate();
  var dayDiff = endDay - startDay;

  // 处理跨月的情况
  if (dayDiff < 0) {
    monthDiff--;
    var tempDate = new Date(endYear, endMonth, 0);
    dayDiff += tempDate.getDate();
  }

  // 考虑闰年的情况
  var leapYearCount = getLeapYearCount(startYear, endYear);
  dayDiff += leapYearCount;

  // 返回日期差异
  return {
    years: yearDiff,
    months: monthDiff,
    days: dayDiff
  };
}

// 辅助函数：计算两个年份之间的闰年数
function getLeapYearCount(startYear, endYear) {
  var count = 0;
  for (var year = startYear; year <= endYear; year++) {
    if ((year % 4 === 0 && year % 100 !== 0) || year % 400 === 0) {
      count++;
    }
  }
  return count;
}

// 示例用法
var startDate = new Date(2020, 1, 1);  // 起始日期为2020年2月1日
var endDate = new Date(2022, 5, 15);  // 结束日期为2022年6月15日

var diff = getDaysBetweenDates(startDate, endDate);
console.log(diff);  // 输出：{ years: 2, months: 4, days: 14 }