Javascript验证Visa和MasterCard信用卡号的方法

2019-11-20 11:59:15

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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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