js校验身份证

function validateIDCard(idCard) {
    const reg = /(^\d{15}$)|(^\d{18}$)|(^\d{17}(\d|X|x)$)/;
    if (!reg.test(idCard)) {
        return false;
    }

    // 加权因子
    const weight = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2];
    // 校验码对应值
    const checkCode = ['1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'];

    let sum = 0;
    for (let i = 0; i < 17; i++) {
        sum += parseInt(idCard.charAt(i), 10) * weight[i];
    }
    const mod = sum % 11;
    const lastChar = idCard.charAt(17).toUpperCase();
    return checkCode[mod] === lastChar;
}

// 使用示例
console.log(validateIDCard('11010519491231002X')); // 应输出 true 或 false