【leetcode】整数转罗马数字

/**
 * @param {number} num
 * @return {string}
 */
var intToRoman = function(num) {
    let valueArray=[1000,900,500,400,100,90,50,40,10,9,5,4,1];
    let romanArray=['M','CM','D','CD','C','XC','L','XL','X','IX','V','IV','I'];
    let result='';
    valueArray.forEach((key,index)=>{
        while(parseInt(num/key)!==0){
            let count=parseInt(num/key);
            for(let i=0;i<count;i++){
                result+=romanArray[index];
            }
            num%=key;
        }
    })
    return result;
};