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，請不要用于非法用途，否則后果自負。
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。
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