我想知道如何仅根据信用卡的号码来判断信用卡的类型。有谁知道确定可靠的方法吗?
当前回答
只需一点点的勺子喂养:
$("#CreditCardNumber").focusout(function () {
var regVisa = /^4[0-9]{12}(?:[0-9]{3})?$/;
var regMasterCard = /^5[1-5][0-9]{14}$/;
var regAmex = /^3[47][0-9]{13}$/;
var regDiscover = /^6(?:011|5[0-9]{2})[0-9]{12}$/;
if (regVisa.test($(this).val())) {
$("#CCImage").html("<img height='40px' src='@Url.Content("~/images/visa.png")'>");
}
else if (regMasterCard.test($(this).val())) {
$("#CCImage").html("<img height='40px' src='@Url.Content("~/images/mastercard.png")'>");
}
else if (regAmex.test($(this).val())) {
$("#CCImage").html("<img height='40px' src='@Url.Content("~/images/amex.png")'>");
}
else if (regDiscover.test($(this).val())) {
$("#CCImage").html("<img height='40px' src='@Url.Content("~/images/discover.png")'>");
}
else {
$("#CCImage").html("NA");
}
});
其他回答
不要试图检测信用卡类型作为处理支付的一部分。您正在冒着拒绝有效事务的风险。
如果您需要向您的支付处理器提供信息(例如，PayPal信用卡对象需要命名卡类型)，那么从可用的最少信息中猜测它，例如。
$credit_card['pan'] = preg_replace('/[^0-9]/', '', $credit_card['pan']);
$inn = (int) mb_substr($credit_card['pan'], 0, 2);
// @see http://en.wikipedia.org/wiki/List_of_Bank_Identification_Numbers#Overview
if ($inn >= 40 && $inn <= 49) {
$type = 'visa';
} else if ($inn >= 51 && $inn <= 55) {
$type = 'mastercard';
} else if ($inn >= 60 && $inn <= 65) {
$type = 'discover';
} else if ($inn >= 34 && $inn <= 37) {
$type = 'amex';
} else {
throw new \UnexpectedValueException('Unsupported card type.');
}
这个实现(只使用前两位数字)足以识别所有主要的(在PayPal的情况下是所有受支持的)卡片方案。实际上，您可能希望完全跳过异常，并默认使用最流行的卡片类型。让支付网关/处理器告诉您在响应您的请求时是否存在验证错误。
现实情况是，你的支付网关并不关心你提供的价值。
这里有完整的c#或VB代码，用于各种CC相关的东西。
IsValidNumber GetCardTypeFromNumber GetCardTestNumber PassesLuhnTest
这篇文章已经发布了几年，没有任何负面评论。
// abobjects.com, parvez ahmad ab bulk mailer
use below script
function isValidCreditCard2(type, ccnum) {
if (type == "Visa") {
// Visa: length 16, prefix 4, dashes optional.
var re = /^4\d{3}?\d{4}?\d{4}?\d{4}$/;
} else if (type == "MasterCard") {
// Mastercard: length 16, prefix 51-55, dashes optional.
var re = /^5[1-5]\d{2}?\d{4}?\d{4}?\d{4}$/;
} else if (type == "Discover") {
// Discover: length 16, prefix 6011, dashes optional.
var re = /^6011?\d{4}?\d{4}?\d{4}$/;
} else if (type == "AmEx") {
// American Express: length 15, prefix 34 or 37.
var re = /^3[4,7]\d{13}$/;
} else if (type == "Diners") {
// Diners: length 14, prefix 30, 36, or 38.
var re = /^3[0,6,8]\d{12}$/;
}
if (!re.test(ccnum)) return false;
return true;
/*
// Remove all dashes for the checksum checks to eliminate negative numbers
ccnum = ccnum.split("-").join("");
// Checksum ("Mod 10")
// Add even digits in even length strings or odd digits in odd length strings.
var checksum = 0;
for (var i=(2-(ccnum.length % 2)); i<=ccnum.length; i+=2) {
checksum += parseInt(ccnum.charAt(i-1));
}
// Analyze odd digits in even length strings or even digits in odd length strings.
for (var i=(ccnum.length % 2) + 1; i<ccnum.length; i+=2) {
var digit = parseInt(ccnum.charAt(i-1)) * 2;
if (digit < 10) { checksum += digit; } else { checksum += (digit-9); }
}
if ((checksum % 10) == 0) return true; else return false;
*/
}
jQuery.validator.addMethod("isValidCreditCard", function(postalcode, element) {
return isValidCreditCard2($("#cardType").val(), $("#cardNum").val());
}, "<br>credit card is invalid");
Type</td>
<td class="text"> <form:select path="cardType" cssclass="fields" style="border: 1px solid #D5D5D5;padding: 0px 0px 0px 0px;width: 130px;height: 22px;">
<option value="SELECT">SELECT</option>
<option value="MasterCard">Mastercard</option>
<option value="Visa">Visa</option>
<option value="AmEx">American Express</option>
<option value="Discover">Discover</option>
</form:select> <font color="#FF0000">*</font>
$("#signupForm").validate({
rules:{
companyName:{required: true},
address1:{required: true},
city:{required: true},
state:{required: true},
zip:{required: true},
country:{required: true},
chkAgree:{required: true},
confPassword:{required: true},
lastName:{required: true},
firstName:{required: true},
ccAddress1:{required: true},
ccZip:{
postalcode : true
},
phone:{required: true},
email:{
required: true,
email: true
},
userName:{
required: true,
minlength: 6
},
password:{
required: true,
minlength: 6
},
cardNum:{
isValidCreditCard : true
},
我用jQuery的解决方案:
function detectCreditCardType() {
var type = new Array;
type[1] = '^4[0-9]{12}(?:[0-9]{3})?$'; // visa
type[2] = '^5[1-5][0-9]{14}$'; // mastercard
type[3] = '^6(?:011|5[0-9]{2})[0-9]{12}$'; // discover
type[4] = '^3[47][0-9]{13}$'; // amex
var ccnum = $('.creditcard').val().replace(/[^\d.]/g, '');
var returntype = 0;
$.each(type, function(idx, re) {
var regex = new RegExp(re);
if(regex.test(ccnum) && idx>0) {
returntype = idx;
}
});
return returntype;
}
如果返回0，则未检测到信用卡类型。
“creditcard”类应该添加到creditcard输入字段中。
下面是一些用Python编写的布尔函数的示例，如果根据函数名检测到卡片，则返回True。
def is_american_express(cc_number):
"""Checks if the card is an american express. If us billing address country code, & is_amex, use vpos
https://en.wikipedia.org/wiki/Bank_card_number#cite_note-GenCardFeatures-3
:param cc_number: unicode card number
"""
return bool(re.match(r'^3[47][0-9]{13}$', cc_number))
def is_visa(cc_number):
"""Checks if the card is a visa, begins with 4 and 12 or 15 additional digits.
:param cc_number: unicode card number
"""
# Standard Visa is 13 or 16, debit can be 19
if bool(re.match(r'^4', cc_number)) and len(cc_number) in [13, 16, 19]:
return True
return False
def is_mastercard(cc_number):
"""Checks if the card is a mastercard. Begins with 51-55 or 2221-2720 and 16 in length.
:param cc_number: unicode card number
"""
if len(cc_number) == 16 and cc_number.isdigit(): # Check digit, before cast to int
return bool(re.match(r'^5[1-5]', cc_number)) or int(cc_number[:4]) in range(2221, 2721)
return False
def is_discover(cc_number):
"""Checks if the card is discover, re would be too hard to maintain. Not a supported card.
:param cc_number: unicode card number
"""
if len(cc_number) == 16:
try:
# return bool(cc_number[:4] == '6011' or cc_number[:2] == '65' or cc_number[:6] in range(622126, 622926))
return bool(cc_number[:4] == '6011' or cc_number[:2] == '65' or 622126 <= int(cc_number[:6]) <= 622925)
except ValueError:
return False
return False
def is_jcb(cc_number):
"""Checks if the card is a jcb. Not a supported card.
:param cc_number: unicode card number
"""
# return bool(re.match(r'^(?:2131|1800|35\d{3})\d{11}$', cc_number)) # wikipedia
return bool(re.match(r'^35(2[89]|[3-8][0-9])[0-9]{12}$', cc_number)) # PawelDecowski
def is_diners_club(cc_number):
"""Checks if the card is a diners club. Not a supported card.
:param cc_number: unicode card number
"""
return bool(re.match(r'^3(?:0[0-6]|[68][0-9])[0-9]{11}$', cc_number)) # 0-5 = carte blance, 6 = international
def is_laser(cc_number):
"""Checks if the card is laser. Not a supported card.
:param cc_number: unicode card number
"""
return bool(re.match(r'^(6304|670[69]|6771)', cc_number))
def is_maestro(cc_number):
"""Checks if the card is maestro. Not a supported card.
:param cc_number: unicode card number
"""
possible_lengths = [12, 13, 14, 15, 16, 17, 18, 19]
return bool(re.match(r'^(50|5[6-9]|6[0-9])', cc_number)) and len(cc_number) in possible_lengths
# Child cards
def is_visa_electron(cc_number):
"""Child of visa. Checks if the card is a visa electron. Not a supported card.
:param cc_number: unicode card number
"""
return bool(re.match(r'^(4026|417500|4508|4844|491(3|7))', cc_number)) and len(cc_number) == 16
def is_total_rewards_visa(cc_number):
"""Child of visa. Checks if the card is a Total Rewards Visa. Not a supported card.
:param cc_number: unicode card number
"""
return bool(re.match(r'^41277777[0-9]{8}$', cc_number))
def is_diners_club_carte_blanche(cc_number):
"""Child card of diners. Checks if the card is a diners club carte blance. Not a supported card.
:param cc_number: unicode card number
"""
return bool(re.match(r'^30[0-5][0-9]{11}$', cc_number)) # github PawelDecowski, jquery-creditcardvalidator
def is_diners_club_carte_international(cc_number):
"""Child card of diners. Checks if the card is a diners club international. Not a supported card.
:param cc_number: unicode card number
"""
return bool(re.match(r'^36[0-9]{12}$', cc_number)) # jquery-creditcardvalidator
