This article describes the method of verifying Visa and MasterCard credit card numbers in Javascript. Share it for your reference. The specific implementation method is as follows:
Visa Verification:
<HTML>
<head>
<title>Visa Example</title>
<script type="text/javascript">
function luhnCheckSum(sCardNum) {
var iOddSum = 0;
var iEvenSum = 0;
var bIsOdd = true;
for (var i=-1; i >= 0; i--) {
var iNum = parseInt((i));
if (bIsOdd) {
iOddSum += iNum;
} else {
iNum = iNum * 2;
if (iNum > 9) {
iNum = eval(().split("").join("+"));
}
iEvenSum += iNum;
}
bIsOdd = !bIsOdd;
}
return ((iEvenSum + iOddSum) % 10 == 0);
}
function isValidVisa(sText) {
var reVisa = /^(4\d{12}(?:\d{3})?)$/;
if ((sText)) {
return luhnCheckSum(RegExp.$1);
} else {
return false;
}
}
function validate() {
var oInput1 = ("txt1");
if (isValidVisa()) {
alert("Valid");
} else {
alert("Invalid!");
}
}
</script>
</head>
<body>
<P>Visa Number: <input type="text" /><br />
<input type="button" value="Validate" onclick="validate()" /></p>
</body>
</html>
MasterCard Verification:
<html>
<head>
<title>MasterCard Example</title>
<script type="text/javascript">
function luhnCheckSum(sCardNum) {
var iOddSum = 0;
var iEvenSum = 0;
var bIsOdd = true;
for (var i=-1; i >= 0; i--) {
var iNum = parseInt((i));
if (bIsOdd) {
iOddSum += iNum;
} else {
iNum = iNum * 2;
if (iNum > 9) {
iNum = eval(().split("").join("+"));
}
iEvenSum += iNum;
}
bIsOdd = !bIsOdd;
}
return ((iEvenSum + iOddSum) % 10 == 0);
}
function isValidMasterCard(sText) {
var reMasterCard = /^(5[1-5]\d{2})[\s\-]?(\d{4})[\s\-]?(\d{4})[\s\-]?(\d{4})$/;
if ((sText)) {
var sCardNum = RegExp.$1 + RegExp.$2 + RegExp.$3 + RegExp.$4;
return luhnCheckSum(sCardNum);
} else {
return false;
}
}
function validate() {
var oInput1 = ("txt1");
if (isValidMasterCard()) {
alert("Valid");
} else {
alert("Invalid!");
}
}
</script>
</head>
<body>
<P>MasterCard Number: <input type="text" /><br />
<input type="button" value="Validate" onclick="validate()" /></p>
</body>
</html>
I hope this article will be helpful to everyone's JavaScript programming.