JavaScript随机生成信用卡卡号的方法

前端技术 2023/09/05 JavaScript

本文实例讲述了JavaScript随机生成信用卡卡号的方法。分享给大家供大家参考。具体分析如下：

这段JS代码根据信用卡卡号产生规则随机生成信用卡卡号，是可以通过验证的，仅供学习参考，请不要用于非法用途，否则后果自负。

var visaPrefixList = new Array(
 \"4539\",
 \"4556\",
 \"4916\",
 \"4532\",
 \"4929\",
 \"40240071\",
 \"4485\",
 \"4716\",
 \"4\"
);
var mastercardPrefixList = new Array(
 \"51\",
 \"52\",
 \"53\",
 \"54\",
 \"55\"
);
var amexPrefixList = new Array(
 \"34\",
 \"37\"
);
var discoverPrefixList = new Array(\"6011\");
var dinersPrefixList = new Array(
 \"300\",
 \"301\",
 \"302\",
 \"303\",
 \"36\",
 \"38\"
);
var enRoutePrefixList = new Array(
 \"2014\",
 \"2149\"
);
var jcbPrefixList = new Array(
 \"35\"
);
var voyagerPrefixList = new Array(\"8699\");
function strrev(str) {
  if (!str) return \'\';
  var revstr=\'\';
  for (i = str.length-1; i>=0; i--)
   revstr+=str.charAt(i)
  return revstr;
}
/*
\'prefix\' is the start of the CC number as a string, 
any number of digits.
\'length\' is the length of the CC number to generate. 
Typically 13 or 16
*/
function completed_number(prefix, length) {
 var ccnumber = prefix;
 // generate digits
 while ( ccnumber.length < (length - 1) ) {
  ccnumber += Math.floor(Math.random()*10);
 }
 // reverse number and convert to int
 var reversedCCnumberString = strrev( ccnumber );
 var reversedCCnumber = new Array();
 for ( var i=0; i < reversedCCnumberString.length; i++ ) {
  reversedCCnumber[i] = parseInt(reversedCCnumberString.charAt(i));
 }
 // calculate sum
 var sum = 0;
 var pos = 0;
 while ( pos < length - 1 ) {
  odd = reversedCCnumber[ pos ] * 2;
  if ( odd > 9 ) {
   odd -= 9;
  }
  sum += odd;
  if ( pos != (length - 2) ) {
 
   sum += reversedCCnumber[ pos +1 ];
  }
  pos += 2;
 }
 // calculate check digit
 var checkdigit = ((Math.floor(sum/10)+1)*10-sum)%10;
 ccnumber += checkdigit;
 return ccnumber;
}
function credit_card_number(prefixList, length, howMany) {
 var result = new Array();
 for (var i = 0; i < howMany; i++) {
  var randomArrayIndex = Math.floor(Math.random() * 
 prefixList.length);
  var ccnumber = prefixList[ randomArrayIndex ];
  result.push( completed_number(ccnumber, length) );
 }
 return result;
}

调用方法：

将上面的代码保存为gencc.js文件

<html>
<head>
<script src=\"gencc.js\" type=\"text/javascript\"></script>
</head>
<body>
<h3>VISA:</h3>
<script>
var visa = credit_card_number(visaPrefixList, 16, 3);
document.write( visa );
</script>
<h3>Amex:</h3>
<script>
var amex = credit_card_number(amexPrefixList, 15, 3);
document.write( amex );
</script>
</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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