如何计算多年范围内的天数和

function calculateDays(startDate, endDate) {
  var startYear = startDate.getFullYear();
  var endYear = endDate.getFullYear();
  var yearDiff = endYear - startYear;

  var leapYears = 0;
  for (var year = startYear; year <= endYear; year++) {
    if ((year % 4 === 0 && year % 100 !== 0) || year % 400 === 0) {
      leapYears++;
    }
  }

  var totalDays = yearDiff * 365 + leapYears;
  return totalDays;
}

// 示例用法
var startDate = new Date('2010-01-01');
var endDate = new Date('2022-12-31');
var days = calculateDays(startDate, endDate);
console.log(days);