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。
=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;
}
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Amex:
希望本文所述对大家的javascript程序设计有所帮助。
