javascript - IBAN验证检查

嗨，我需要使用javascript进行 IBAN验证检查。

我需要遵循的规则是

验证IBAN
通过将IBAN转换为整数并对其执行基本的mod-97操作(如ISO 7064中所述)来验证IBAN。如果IBAN有效，则余数等于
1。

1 。检查每个国家的IBAN总长度是否正确。如果不是，则IBAN无效

2 。将四个初始字符移动到字符串的末尾

3 。用两位数字替换字符串中的每个字母，从而扩展字符串，其中A = 10，B = 11，...，Z = 35

4 。将字符串解释为十进制整数，并计算该数字除以97的余数

我正在为白俄罗斯的IBAN进行此操作，因此必须遵循以下格式

2C 31N-

RU1230000000000000000000000000000

我如何修改以下内容以符合上述规则；

function validateIBAN(iban) {
    var newIban = iban.toUpperCase(),
        modulo = function (divident, divisor) {
            var cDivident = '';
            var cRest = '';

            for (var i in divident ) {
                var cChar = divident[i];
                var cOperator = cRest + '' + cDivident + '' + cChar;

                if ( cOperator < parseInt(divisor) ) {
                        cDivident += '' + cChar;
                } else {
                        cRest = cOperator % divisor;
                        if ( cRest == 0 ) {
                            cRest = '';
                        }
                        cDivident = '';
                }

            }
            cRest += '' + cDivident;
            if (cRest == '') {
                cRest = 0;
            }
            return cRest;
        };

    if (newIban.search(/^[A-Z]{2}/gi) < 0) {
        return false;
    }

    newIban = newIban.substring(4) + newIban.substring(0, 4);

    newIban = newIban.replace(/[A-Z]/g, function (match) {
        return match.charCodeAt(0) - 55;
    });

    return parseInt(modulo(newIban, 97), 10) === 1;
}

最佳答案

根据http://toms-cafe.de/iban/iban.js的工作，我开发了IBAN check版本。
您可以通过修改变量CODE_LENGTHS来修改国家/地区支持。
这是我的实现:

function alertValidIBAN(iban) {
    alert(isValidIBANNumber(iban));
}

/*
 * Returns 1 if the IBAN is valid
 * Returns FALSE if the IBAN's length is not as should be (for CY the IBAN Should be 28 chars long starting with CY )
 * Returns any other number (checksum) when the IBAN is invalid (check digits do not match)
 */
function isValidIBANNumber(input) {
    var CODE_LENGTHS = {
        AD: 24, AE: 23, AT: 20, AZ: 28, BA: 20, BE: 16, BG: 22, BH: 22, BR: 29,
        CH: 21, CR: 21, CY: 28, CZ: 24, DE: 22, DK: 18, DO: 28, EE: 20, ES: 24,
        FI: 18, FO: 18, FR: 27, GB: 22, GI: 23, GL: 18, GR: 27, GT: 28, HR: 21,
        HU: 28, IE: 22, IL: 23, IS: 26, IT: 27, JO: 30, KW: 30, KZ: 20, LB: 28,
        LI: 21, LT: 20, LU: 20, LV: 21, MC: 27, MD: 24, ME: 22, MK: 19, MR: 27,
        MT: 31, MU: 30, NL: 18, NO: 15, PK: 24, PL: 28, PS: 29, PT: 25, QA: 29,
        RO: 24, RS: 22, SA: 24, SE: 24, SI: 19, SK: 24, SM: 27, TN: 24, TR: 26,
        AL: 28, BY: 28, CR: 22, EG: 29, GE: 22, IQ: 23, LC: 32, SC: 31, ST: 25,
        SV: 28, TL: 23, UA: 29, VA: 22, VG: 24, XK: 20
    };
    var iban = String(input).toUpperCase().replace(/[^A-Z0-9]/g, ''), // keep only alphanumeric characters
            code = iban.match(/^([A-Z]{2})(\d{2})([A-Z\d]+)$/), // match and capture (1) the country code, (2) the check digits, and (3) the rest
            digits;
    // check syntax and length
    if (!code || iban.length !== CODE_LENGTHS[code[1]]) {
        return false;
    }
    // rearrange country code and check digits, and convert chars to ints
    digits = (code[3] + code[1] + code[2]).replace(/[A-Z]/g, function (letter) {
        return letter.charCodeAt(0) - 55;
    });
    // final check
    return mod97(digits);
}

function mod97(string) {
    var checksum = string.slice(0, 2), fragment;
    for (var offset = 2; offset < string.length; offset += 7) {
        fragment = String(checksum) + string.substring(offset, offset + 7);
        checksum = parseInt(fragment, 10) % 97;
    }
    return checksum;
}

input { width:300px; }

Enter IBAN
<input type="test" id="iban"/>
<button onclick="alertValidIBAN(null);">check IBAN</button>