JavaScript method for randomly generating credit card numbers _ javascript skills

This article describes how to generate a random credit card number using JavaScript, and describes how to generate a random credit card number using javascript, for more information about how to generate a random credit card number using JavaScript, see the example in this article. Share it with you for your reference. The specific analysis is as follows:

This JS Code generates a random credit card number based on the rules generated by the credit card number. It can be verified. It is for your reference only. Please do not use it for illegal purposes. Otherwise, you will be liable for the consequences.

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;}

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Save the above Code as a gencc. js File