Document
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<!--react cdn-->
<script crossorigin src="https://unpkg.com/react@17/umd/react.production.min.js"></script>
<script crossorigin src="https://unpkg.com/react-dom@17/umd/react-dom.production.min.js"></script>
<!--babel cdn-->
<script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
<title>Document</title>
</head>
<body>
<div id="root"></div>
<script type="text/babel">
//Btn Component, text와 fuce를 인자로 받음
function Btn({text, func}) {
return(
//text를 func에 넣은 결과 값 출력
<button style ={{border : 0, backgroundColor : "blue", color : "white", borderRadius : 20}}>{func(text)}</button>
)
}
function App () {
//App Component -> 해당 컴포넌트 빌드 예정
//입력 Value 값 선언
const [value, setValue] = React.useState("Upper And Lower")
//대문자 변경 함수
const toUpper = (value) => value.toUpperCase()
//소문자 변경 함수
const toLower = (value) => value.toLowerCase()
return(
<div>
<input type="text" onChange={(e)=>setValue(e.target.value)} />
<br />
UPPER : <Btn text = {value} func = {toUpper}/>
<br />
LOWER : <Btn text = {value}func = {toLower} />
</div>
)
}
//ReactDom을 이용하여, root Div에 App Render
ReactDOM.render(
<App />, document.getElementById("root")
)
</script>
</body>
</html>