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【JS】随机生成信用卡卡号

作者:Duncan / 发布于2014/11/18/ 578


	/*
	Javascript credit card number generator
	Copyright (C) 2006-2012 Graham King graham@gkgk.org

	This program is free software; you can redistribute it and/or
	modify it under the terms of the GNU General Public License
	as published by the Free Software Foundation; either version 2
	of the License, or (at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

	www.darkcoding.net
	*/

	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>

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