统一社会信用代码 验证js

function validateCreditCode(code) {
    const weightFactors = [1, 3, 9, 27, 19, 26, 16, 17, 20, 29, 25, 13, 8, 24, 10, 30, 28];
    const checkCodeMap = {
        '0': 0,
        '1': 1,
        '2': 2,
        '3': 3,
        '4': 4,
        '5': 5,
        '6': 6,
        '7': 7,
        '8': 8,
        '9': 9,
        'X': 30
    };
    if (code.length!== 18) {
        return false;
    }
    let sum = 0;
    for (let i = 0; i < 17; i++) {
        const digit = parseInt(code[i]);
        if (isNaN(digit)) {
            return false;
        }
        sum += digit * weightFactors[i];
    }
    const mod = sum % 31;
    const expectedCheckCode = checkCodeMap[31 - mod];
    const actualCheckCode = checkCodeMap[code[17]];
    return expectedCheckCode === actualCheckCode;
}