完整的JavaScript版的信用卡校验代码完整的JavaScript版的信用卡校验代码

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我是靠谱客的博主简单网络，最近开发中收集的这篇文章主要介绍完整的JavaScript版的信用卡校验代码完整的JavaScript版的信用卡校验代码，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

 1 function isValidCreditCard(type, ccnum) {
 2
if (type == "Visa") {
 3
// Visa: length 16, prefix 4, dashes optional.
 4
var re = /^4d{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 }