js根据出生日期计算年龄

function calculateAge(birthDate) {
    const today = new Date();
    const birthDateObj = new Date(birthDate);
    
    let age = today.getFullYear() - birthDateObj.getFullYear();
    const monthDifference = today.getMonth() - birthDateObj.getMonth();
    
    // 如果当前月份小于出生月份，或者月份相同但日期小于出生日期，则年龄减一
    if (monthDifference < 0 || (monthDifference === 0 && today.getDate() < birthDateObj.getDate())) {
        age--;
    }
    
    return age;
}

// 示例使用
const birthDate = '1990-05-15';
console.log(`年龄: ${calculateAge(birthDate)}岁`);

function isValidDate(dateString) {
    const date = new Date(dateString);
    return !isNaN(date.getTime());
}

const birthDate = '1990-05-15';
if (isValidDate(birthDate)) {
    console.log(`年龄: ${calculateAge(birthDate)}岁`);
} else {
    console.log('无效的日期格式');
}