toUpperCase() / toLowerCase()

06. tooUpperCase() / toLowerCase()

toUpperCase() : 문자열을 대문자로 변경합니다.
toLowerCase() : 문자열을 소문자로 변경합니다.

번호	기본값	메서드	리턴값

const str1 = "javascript";
const currentStr1 = str1.toUpperCase();
document.querySelector(".sample06_N1").innerHTML = "1";
document.querySelector(".sample06_Q1").innerHTML = "javascript";
document.querySelector(".sample06_M1").innerHTML = "toUpperCase()";
document.querySelector(".sample06_P1").innerHTML = currentStr1;

const str2 = "JAVASCRIPT";
const currentStr2 = str2.toLowerCase();
document.querySelector(".sample06_N2").innerHTML = "2";
document.querySelector(".sample06_Q2").innerHTML = "JAVASCRIPT";
document.querySelector(".sample06_M2").innerHTML = "toLowerCase()";
document.querySelector(".sample06_P2").innerHTML = currentStr2;