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@Hamilton

I have a function to check the credit card number is valid or not. But I have some other questions.

graceye88(Graceye88)
本文发表在 rolia.net 枫下论坛My questions:
1. How to realize the transaction through Internet.
2. As I know, some small company use a third company(for example: Wordpay ) to do the payment online. Do you guys know how it works?
3. As a small company , can I get the money directly from Visa, Master or etc.
I am a beginner and blind in this area, so ask all the experts for help.


function isValidCardNumber(strNum)
{
var nCheck = 0;
var nDigit = 0;
var bEven = false;
var dLength = 0;
var checkOk = false;

strNum = strNum.replace(/ /g,"");

dLength = strNum.length;

if (strNum.substring(0,1) == '4')
{
if (dLength == 13 || dLength == 16)
checkOk = true;
else
return false;
}
else if (strNum.substring(0,2) == '34' || strNum.substring(0,2) == '37')
{
if (dLength == 15)
checkOk = true;
else
return false;
}
else if (strNum.substring(0,2) == '51' || strNum.substring(0,2) == '52'
|| strNum.substring(0,2) == '53' || strNum.substring(0,2) == '54'
|| strNum.substring(0,2) == '55')
{
if (dLength == 16)
checkOk = true;
else
return false;
}
else
return false;


for (n = strNum.length - 1; n >= 0; n--)
{
var cDigit = strNum.charAt (n);
if (isDigit (cDigit))
{
var nDigit = parseInt(cDigit, 10);
if (bEven)
{
if ((nDigit *= 2) > 9)
nDigit -= 9;
}
nCheck += nDigit;
bEven = ! bEven;
}
else if (cDigit != ' ' && cDigit != '.' && cDigit != '-')
{
return false;
}
}
return (nCheck % 10) == 0;
}更多精彩文章及讨论，请光临枫下论坛 rolia.net
(#1222566@0)
Last Updated: 2003-6-4
This post has been archived. It cannot be replied.
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Replies, comments and Discussions:

  • 工作学习 / IT杂谈 / 请问大家谁写过on-line信用卡信息试别(试别name, number,...)的use Script . 如何证明用户输入的信息是否数实? -hunhuner(混混儿); 2003-5-27 (#1208661@0)
    • web knows ==> -mssg(mssg); 2003-5-27 (#1208972@0)
      • thank you, I will try -hunhuner(混混儿); 2003-5-28 (#1209248@0)
    • 俺用perl写过,就是把所有的属性，当作相应变量提交过去一个request，然后等收到一个response，根据返回值判断是否成功。 -swanson(swanson); 2003-5-27 (#1208997@0)
      • thank you -hunhuner(混混儿); 2003-5-28 (#1209251@0)
    • 只是检查号码是否符合生成规则，并不保证号码有效。 -junhua(Henry); 2003-5-28 (#1209261@0)
      • 请问 How to 保证号码有效? I saw some shopping cart package having this functional (not very sure) -hunhuner(混混儿); 2003-5-28 (#1209741@0)
        • 保证有效得去VISA查吧，自己肯定无法判断的 -junhua(Henry); 2003-5-29 (#1211309@0)
    • 可以用JavaScript在客户端实现,一般算法是这样， -bill_hu(huhu); 2003-5-29 {259} (#1211157@0)
      首先验证信用卡的位数和第一个数字或前两个数字是否有效，比如说VISA卡长度为13或16，第一个数字必须为4；MasterCard卡长度为16，前两个数字位于51－55之间；然后在按照用户输入的信用卡号码依照算法将位数进行处理，最后看能否被10整除，如果能整除，则验证通过，否则号码无效。
    • I have a function to check the credit card number is valid or not. But I have some other questions. -graceye88(Graceye88); 2003-6-4 {1901} (#1222566@0)
      本文发表在 rolia.net 枫下论坛My questions:
      1. How to realize the transaction through Internet.
      2. As I know, some small company use a third company(for example: Wordpay ) to do the payment online. Do you guys know how it works?
      3. As a small company , can I get the money directly from Visa, Master or etc.
      I am a beginner and blind in this area, so ask all the experts for help.


      function isValidCardNumber(strNum)
      {
      var nCheck = 0;
      var nDigit = 0;
      var bEven = false;
      var dLength = 0;
      var checkOk = false;

      strNum = strNum.replace(/ /g,"");

      dLength = strNum.length;

      if (strNum.substring(0,1) == '4')
      {
      if (dLength == 13 || dLength == 16)
      checkOk = true;
      else
      return false;
      }
      else if (strNum.substring(0,2) == '34' || strNum.substring(0,2) == '37')
      {
      if (dLength == 15)
      checkOk = true;
      else
      return false;
      }
      else if (strNum.substring(0,2) == '51' || strNum.substring(0,2) == '52'
      || strNum.substring(0,2) == '53' || strNum.substring(0,2) == '54'
      || strNum.substring(0,2) == '55')
      {
      if (dLength == 16)
      checkOk = true;
      else
      return false;
      }
      else
      return false;


      for (n = strNum.length - 1; n >= 0; n--)
      {
      var cDigit = strNum.charAt (n);
      if (isDigit (cDigit))
      {
      var nDigit = parseInt(cDigit, 10);
      if (bEven)
      {
      if ((nDigit *= 2) > 9)
      nDigit -= 9;
      }
      nCheck += nDigit;
      bEven = ! bEven;
      }
      else if (cDigit != ' ' && cDigit != '.' && cDigit != '-')
      {
      return false;
      }
      }
      return (nCheck % 10) == 0;
      }更多精彩文章及讨论，请光临枫下论坛 rolia.net
    • see the c# code -agentkiller(key); 2003-6-4 {510} (#1222974@0)
      public bool Validate(string cardNumber, DateTime expDate)
      {
      if(expDate >= DateTime.Today)
      {
      int total = 0;
      int temp = 0;
      char [] ccDigits = cardNumber.ToCharArray();
      for(int i = 0; i < cardNumber.Length; i++)
      {
      if(((i+1)%2) == 0)
      {
      total += int.Parse(ccDigits[i].ToString());
      }
      else
      {
      temp = int.Parse(ccDigits[i].ToString()) * 2;
      if(temp > 9)
      {
      temp = (int)temp - 9;
      }
      total += temp;
      }
      }
      if((total%10) ==0)
      {
      return true;
      }
      else
      {
      return false;
      }
      }
      else
      {
      return false;
      }
      }

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