예제 코드 5.5 Note를 제거하기 전에 먼저 렌더링한다

let secondsLeft = 5
 
let interval = setInterval(() => {
    if (secondsLeft == 0) {
        ReactDOM.render(
            <div>
                Note was removed after {secondsLeft} seconds.
            </div>,
            document.getElementById('content')
        )
        clearInterval(interval)
    } else {
        ReactDOM.render(
            <div>
                <Note secondsLeft={secondsLeft}/>
            </div>,
            document.getElementById('content')
        )
    }
    secondsLeft--
}, 1000)

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