코드네임 :

DOCTYPE html>html lang="en"> head> meta charset="UTF-8" /> meta name="viewport" content="width=device-width, initial-scale=1.0" /> title>Documenttitle> head> body> div id="root">div> body> script src="https://unpkg.com/react@17.0.2/umd/react.production.min.js">script> script src="https://unpkg.com/react-dom@17.0.2/umd/react-dom.production.min.js">script> script src="https://unpkg.com/@babel/stan..

html 태그는 소문자로컴포넌트는 대문자로 흠 리액트는 코드 재사용이 쉬워보이는 군요  const [변수, 변수_변경함수] = React.useState(초기값);  DOCTYPE html>html lang="en"> head> meta charset="UTF-8" /> meta name="viewport" content="width=device-width, initial-scale=1.0" /> title>Documenttitle> head> body> div id="root">div> body> script src="https://unpkg.com/react@17.0.2/umd/react.production.min.js">script> script src="https://unpkg.com/react-..