JavaScript随机生成信用卡卡号的方法

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来源：阅读：956 次日期：2015-04-09 16:47:05

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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>

</head>

<body>

var visa = credit_card_number(visaPrefixList, 16, 3);

document.write( visa );

</script>

var amex = credit_card_number(amexPrefixList, 15, 3);

document.write( amex );

</script>

</body>

</html>

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