[javascript] 프로그래머스 / 시저 암호

function solution(s, n) {
    var answer = '';
    for(let i=0;i<s.length;i++){
        let ascilCode = s[i].charCodeAt();
        if(ascilCode>=65&&ascilCode<=90){
            let nPlus = ascilCode+n;
            if(nPlus>90){
                answer += String.fromCharCode(nPlus-26);
            }
            else{
                answer += String.fromCharCode(nPlus);
            }
        }
        else if(ascilCode>=97&&ascilCode<=122){
            let nPlus = ascilCode+n;
            if(nPlus>122){
                answer += String.fromCharCode(nPlus-26);
            }
            else{
                answer += String.fromCharCode(nPlus);
            }
        }
        else if(s[i]===" "){
             answer += " ";
        }
    }
    return answer;
}