js 身份证校验码

function validateIDCard(idCard) {
    const weights = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2];
    const checkCodes = ['1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'];

    if (idCard.length !== 18) {
        return false;
    }

    let sum = 0;
    for (let i = 0; i < 17; i++) {
        sum += parseInt(idCard[i]) * weights[i];
    }

    const mod = sum % 11;
    const checkCode = checkCodes[mod];

    return checkCode === idCard[17].toUpperCase();
}

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