Javascript验证Visa和MasterCard信用卡号的方法

时间:2020-05-14 红薯人气:0

本文实例讲述了Javascript验证Visa和MasterCard信用卡号的方法。分享给大家供大家参考。具体实现方法如下：

visa验证：

<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验证：

<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>

希望本文所述对大家的javascript程序设计有所帮助。

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