15位身份证 年龄 js

function calculateAge(idNumber) {
    // 提取出生日期码（YYMMDD格式）
    const birthDateStr = idNumber.substring(6, 12);
    const year = parseInt(birthDateStr.substring(0, 2), 10);
    const month = parseInt(birthDateStr.substring(2, 4), 10);
    const day = parseInt(birthDateStr.substring(4, 6), 10);

    // 将年份转换为四位数（假设1900年之后出生）
    const birthYear = year + 1900;
    const birthMonth = month;
    const birthDay = day;

    // 获取当前日期
    const today = new Date();
    const currentYear = today.getFullYear();
    const currentMonth = today.getMonth() + 1; // 月份从0开始
    const currentDay = today.getDate();

    // 计算年龄
    let age = currentYear - birthYear;
    if (currentMonth < birthMonth || (currentMonth === birthMonth && currentDay < birthDay)) {
        age--;
    }

    return age;
}

// 示例使用
const idNumber = "123456789012345"; // 示例15位身份证号码
const age = calculateAge(idNumber);
console.log(`年龄: ${age}`);