javascript - 在 JavaScript 中将数字转换为罗马数字

Question

如何将整数转换为 roman numerals ？

function romanNumeralGenerator (int) {

}

例如，请参阅以下示例输入和输出:

1 = "I"
5 = "V"
10 = "X"
20 = "XX"
3999 = "MMMCMXCIX"

注意:只支持 1 到 3999 之间的数字

Answer 1

我在这个博客上使用 google 发现了一个不错的博客:

http://blog.stevenlevithan.com/archives/javascript-roman-numeral-converter

function romanize (num) {
    if (isNaN(num))
        return NaN;
    var digits = String(+num).split(""),
        key = ["","C","CC","CCC","CD","D","DC","DCC","DCCC","CM",
               "","X","XX","XXX","XL","L","LX","LXX","LXXX","XC",
               "","I","II","III","IV","V","VI","VII","VIII","IX"],
        roman = "",
        i = 3;
    while (i--)
        roman = (key[+digits.pop() + (i * 10)] || "") + roman;
    return Array(+digits.join("") + 1).join("M") + roman;
}