完整的JavaScript版的信用卡校验代码
1 function isValidCreditCard(type, ccnum) { 2 if (type == "Visa") { 3 // Visa: length 16, prefix 4, dashes optional. 4 var re = /^4\d{3}-?\d{4}-?\d{4}-?\d{4}$/; 5 } else if (type == "MC") { 6 // Mastercard: length 16, prefix 51-55, dashes optional. 7 var re = /^5[1-5]\d{2}-?\d{4}-?\d{4}-?\d{4}$/; 8 } else if (type == "Disc") { 9 // Discover: length 16, prefix 6011, dashes optional. 10 var re = /^6011-?\d{4}-?\d{4}-?\d{4}$/; 11 } else if (type == "AmEx") { 12 // American Express: length 15, prefix 34 or 37. 13 var re = /^3[4,7]\d{13}$/; 14 } else if (type == "Diners") { 15 // Diners: length 14, prefix 30, 36, or 38. 16 var re = /^3[0,6,8]\d{12}$/; 17 } 18 if (!re.test(ccnum)) return false; 19 // Remove all dashes for the checksum checks to eliminate negative numbers 20 ccnum = ccnum.split("-").join(""); 21 // Checksum ("Mod 10") 22 // Add even digits in even length strings or odd digits in odd length strings. 23 var checksum = 0; 24 for (var i=(2-(ccnum.length % 2)); i<=ccnum.length; i+=2) { 25 checksum += parseInt(ccnum.charAt(i-1)); 26 } 27 // Analyze odd digits in even length strings or even digits in odd length strings. 28 for (var i=(ccnum.length % 2) + 1; i<ccnum.length; i+=2) { 29 var digit = parseInt(ccnum.charAt(i-1)) * 2; 30 if (digit < 10) { checksum += digit; } else { checksum += (digit-9); } 31 } 32 if ((checksum % 10) == 0) return true; else return false; 33 }
完整的JavaScript版的信用卡校验代码
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