js 随机生成信用卡号

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。

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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

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<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。