Javascript驗證Visa和MasterCard信用卡號的方法

2024-05-06 16:23:52

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這篇文章主要介紹了Javascript驗證Visa和MasterCard信用卡號的方法,涉及javascript正則驗證的相關技巧,具有一定參考借鑒價值,需要的朋友可以參考下

本文實例講述了Javascript驗證Visa和MasterCard信用卡號的方法。分享給大家供大家參考。具體實現方法如下：

visa驗證：

<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=sCardNum.length-1; i >= 0; i--) {

var iNum = parseInt(sCardNum.charAt(i));

if (bIsOdd) {

iOddSum += iNum;

} else {

iNum = iNum * 2;

if (iNum > 9) {

iNum = eval(iNum.toString().split("").join("+"));

}

iEvenSum += iNum;

}

bIsOdd = !bIsOdd;

}

return ((iEvenSum + iOddSum) % 10 == 0);

}

function isValidVisa(sText) {

var reVisa = /^(4/d{12}(?:/d{3})?)$/;

if (reVisa.test(sText)) {

return luhnCheckSum(RegExp.$1);

} else {

return false;

}

}

function validate() {

var oInput1 = document.getElementById("txt1");

if (isValidVisa(oInput1.value)) {

alert("Valid");

} else {

alert("Invalid!");

}

}

</script>

</head>

<body>

<P>Visa Number: <input type="text" id="txt1" /><br />

<input type="button" value="Validate" onclick="validate()" /></p>

</body>

</html>

MasterCard驗證：

<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=sCardNum.length-1; i >= 0; i--) {

var iNum = parseInt(sCardNum.charAt(i));

if (bIsOdd) {

iOddSum += iNum;

} else {

iNum = iNum * 2;

if (iNum > 9) {

iNum = eval(iNum.toString().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 (reMasterCard.test(sText)) {

var sCardNum = RegExp.$1 + RegExp.$2 + RegExp.$3 + RegExp.$4;

return luhnCheckSum(sCardNum);

} else {

return false;

}

}

function validate() {

var oInput1 = document.getElementById("txt1");

if (isValidMasterCard(oInput1.value)) {

alert("Valid");

} else {

alert("Invalid!");

}

}

</script>

</head>

<body>

<P>MasterCard Number: <input type="text" id="txt1" /><br />

<input type="button" value="Validate" onclick="validate()" /></p>

</body>

</html>