显示相对时间时组合天数和小时数

function formatRelativeTime(startDate, endDate) {
    const diffInMs = endDate - startDate;
    const diffInDays = Math.floor(diffInMs / (1000 * 60 * 60 * 24));
    const diffInHours = Math.floor((diffInMs % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));

    let result = '';
    if (diffInDays > 0) {
        result += `${diffInDays}天`;
    }
    if (diffInHours > 0) {
        result += `${diffInHours}小时`;
    }
    return result;
}

// 示例用法
const startDate = new Date('2023-10-01T00:00:00Z');
const endDate = new Date('2023-10-03T06:00:00Z');
console.log(formatRelativeTime(startDate, endDate)); // 输出: 2天6小时