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<!DOCTYPE html>
<html lang="en">
<body>
<script src="https://unpkg.com/react@18/umd/react.development.js" crossorigin></script>
<script src="https://unpkg.com/react-dom@18/umd/react-dom.development.js" crossorigin></script>
<script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
<script type="text/babel">
const root = document.getElementById("root");
function App() {
const [amount, setAmount] = React.useState(0);
const [inverted, setInverted] = React.useState(false); //어떤걸 활성화시킬지
const onChange = (event) => {
setAmount(event.target.value);
//target = 방금 바뀐 Input
};
const reset = () => setAmount(0); //0으로 리셋
const onInvert = () => { //리셋시키고 Inverted바꾸기
reset();
setInverted((current) => !current);
};
return (
<div>
<div>
<h1>Super Converter</h1>
<label htmlFor="minutes">Minutes</label>
<input
value={inverted ? amount*60 : amount} //event가 발생했을때 값을 업데이트해주고, UI에 표시해주는것
id="minutes"
placeholder="Minutes"
type="number"
onChange={onChange} //event를 실행해주는 것 하나
disabled={inverted} //비활성화 해주는것
/>
</div>
<div>
<label htmlFor="hours">Hours</label>
<input
value={inverted ? amount : amount/60}
id="hours"
placeholder="Hours"
type="number"
onChange={onChange}
disabled={!inverted}
/>
</div>
<button onClick={reset}>Reset</button>
<button onClick={onInvert}>{inverted ? "inverted_true" : "inverted_false"}</button> //누를때마다 달라짐
</div>
);
};
ReactDOM.render(<App />, root)
</script>
<div id="root">
</div>
</body>
</html>반응형
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