Home > Article > Web Front-end > Javascript method to verify Visa and MasterCard credit card numbers_javascript skills

Javascript method to verify Visa and MasterCard credit card numbers_javascript skills

WBOYOriginal: 2016-05-16 15:48:462084browse

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}(&#63;:\d{3})&#63;)$/;
     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\-]&#63;(\d{4})[\s\-]&#63;(\d{4})[\s\-]&#63;(\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。

Statement：

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Previous article：Detailed explanation of Generator_Basic knowledge in JavaScript ES6Next article：Detailed explanation of Generator_Basic knowledge in JavaScript ES6

See more

Javascript method to verify Visa and MasterCard credit card numbers_javascript skills

Related articles