Roman Numeral Converter

题目

将给定的数字转换成罗马数字

代码

function convert(num) {  var arr= [["","I","II","III","IV","V","VI","VII","VIII","IX"],            ["","X","XX","XXX","XL","L","LX","LXX","LXXX","XC"],            ["","C","CC","CCC","CD","D","DC","DCC","DCCC","CM"],            ["","M","MM","MMM"]];  var a,b;  var index = 0;  var roman = "";  while(num !== 0) {    a = num % 10;    num = Math.floor(num / 10);    b = arr[index][a];    roman = b + roman;    index++;  } return roman;}convert(999);