在javascript中计算天数

function calculateDaysBetweenDates(date1, date2) {
  const oneDay = 24 * 60 * 60 * 1000; // 一天的毫秒数
  const timeDiff = Math.abs(date2.getTime() - date1.getTime()); // 获取时间差的绝对值
  const days = Math.floor(timeDiff / oneDay); // 将时间差转换为天数
  return days;
}

// 示例用法
const startDate = new Date('2022-01-01');
const endDate = new Date('2022-01-10');
const daysBetween = calculateDaysBetweenDates(startDate, endDate);
console.log(daysBetween); // 输出结果为 9