我有以下函数,可以根据 Luhn 算法验证仅包含数字的数字输入:
function isCheckdigitCorrect(value) {
// accept only digits, dashes or spaces
if (/[^0-9-\s]+/.test(value)) return false;
var nCheck = 0, nDigit = 0, bEven = false;
value = value.replace(/\D/g, "");
for (var n = value.length - 1; n >= 0; n--) {
var cDigit = value.charAt(n),
nDigit = parseInt(cDigit, 10);
if (bEven) {
if ((nDigit *= 2) > 9) nDigit -= 9;
}
nCheck += nDigit;
bEven = !bEven;
}
return (nCheck % 10) == 0;
}
无论如何,我也可以验证字母数字,所以假设我有一个有效的 ID: AC813(6) , () 是校验和。那么有没有一种方法可以防止用户错误地输入 AF813(6),这样就会告诉用户错误的 ID。
感谢您的帮助
最佳答案
用数字替换字母字符来计算校验和会严重降低检查的稳健性,我能想到的最简单的建议是使用维基百科上描述的Luhn mod N algorithm。
将算法转换为 JavaScipt 相对简单:以下不是我的代码,而是 wiki 文章的翻译 - 所以我不会假装它是最佳的。它旨在处理不区分大小写的 ASCII 字母字符和十进制数字的字符串。有关文档,请参阅 wiki。
// based on https://en.wikipedia.org/wiki/Luhn_mod_N_algorithm
var charset = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
function NumberOfValidInputCharacters () { return charset.length; }
function CodePointFromCharacter(character) { return charset.indexOf(character)};
function CharacterFromCodePoint( codePoint) { return charset[codePoint]};
function GenerateCheckCharacter (input) {
var factor = 2;
var sum = 0;
var n = NumberOfValidInputCharacters();
input = input.toUpperCase();
// Starting from the right and working leftwards is easier since
// the initial "factor" will always be "2"
for (var i = input.length - 1; i >= 0; i--) {
var codePoint = CodePointFromCharacter(input[i]);
if( codePoint < 0) {
return "";
}
var addend = factor * codePoint;
// Alternate the "factor" that each "codePoint" is multiplied by
factor = (factor == 2) ? 1 : 2;
// Sum the digits of the "addend" as expressed in base "n"
addend = Math.floor(addend / n) + (addend % n);
sum += addend;
}
// Calculate the number that must be added to the "sum"
// to make it divisible by "n"
var remainder = sum % n;
var checkCodePoint = (n - remainder) % n;
return CharacterFromCodePoint(checkCodePoint);
}
function ValidateCheckCharacter(input) {
var factor = 1;
var sum = 0;
var n = NumberOfValidInputCharacters();
input = input.toUpperCase();
// Starting from the right, work leftwards
// Now, the initial "factor" will always be "1"
// since the last character is the check character
for (var i = input.length - 1; i >= 0; i--) {
var codePoint = CodePointFromCharacter(input[i]);
if( codePoint < 0) {
return false;
}
var addend = factor * codePoint;
// Alternate the "factor" that each "codePoint" is multiplied by
factor = (factor == 2) ? 1 : 2;
// Sum the digits of the "addend" as expressed in base "n"
addend = Math.floor(addend / n) + (addend % n);
sum += addend;
}
var remainder = sum % n;
return (remainder == 0);
}
// quick test:
console.log ("check character for 'abcde234': %s",
GenerateCheckCharacter("abcde234"));
console.log( "validate 'abcde2349' : %s " ,
ValidateCheckCharacter( "abcde2349"));
console.log( "validate 'abcde234X' : %s" ,
ValidateCheckCharacter( "abcde234X"));
关于javascript - 我需要使用字母数字校验和来验证输入字符串,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/43669345/