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算法：Roman Numeral Converter

Q: 将给定的数字转换成罗马数字。
所有返回的 罗马数字 都应该是大写形式。

	 function convert(num) {
  	 var nums = [1000,900,500,400,100,90,50,40,10,9,5,4,1];
  	 var romans =["M","CM","D","CD","C","XC","L","XL","X","IX","V","IV","I"];
  	 var str = '';
  	 

  	 //给定数字拆分为千位、百位、十位、个位，然后再由大至小依次进行拼接。
 	 //对 nums 的每一项进行遍历，每当传入的 num 大于或等于当前项时，
 	 //将其对应的罗马数字推入之前声明的字符串，并把 num 值减去当前符合条件的数值。
 	 

  	 nums.forEach(function(value,index,nums){
   		 while(num >= value){
    		  str += romans[index];
    		  num -= value;
  		 }
  	 });
  	 return str;
	 }
	 convert(1000);
	 

	 
	 >> M
	 
	 

参考Array.prototype.forEach()

	 function convert(num) {
   	 var nums = [1000,900,500,400,100,90,50,40,10,9,5,4,1];
 	 var romans =["M","CM","D","CD","C","XC","L","XL","X","IX","V","IV","I"];
  	 var str = '';
	 

  	 
  	 //改写一下
 	 
 	 

 	 for (var i=0;i<nums.length;i++){
 	 while(num >= nums[i]){
  	     str += romans[i];
   	     num -= nums[i];
   	  }
 	  }
 	 return str;
	  }
	  convert(1234);
	 

	 
	 >> MCCXXXIV
	 
 	 

推酷：Roman Numeral Converter(算法)