JavaScriptがクレジットカード番号をランダムに生成する方法
8422 ワード
このJSコードはクレジットカード番号のルールによってランダムにクレジットカード番号を生成します.検証を通じて、学習の参考だけにして、不正な用途に使わないでください.でないと、結果は自負します.
上のコードをgencc.jsファイルとして保存します.
転載先:https://www.cnblogs.com/tsql/p/7340084.html
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; } 上のコードをgencc.jsファイルとして保存します.
<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> 転載先:https://www.cnblogs.com/tsql/p/7340084.html