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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