本文實例講述了JavaScript隨機生成信用卡卡號的方法。分享給大家供大家參考。具體分析如下：
這段JS代碼根據信用卡卡號產生規則隨機生成信用卡卡號，是可以通過驗證的，僅供學習參考，請不要用於非法用途，否則後果自負。
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;
}
調用方法：
將上面的代碼保存為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>
希望本文所述對大家的javascript程序設計有所幫助。