chap05 HeavyUI.js

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  function sleep(delay) {
  let start = Date.now();
  while (Date.now() - start < delay);
}
 
// delay 밀리초 지연 발생
export default function HeavyUI({ delay }) {
  sleep(delay);
  return <p>지연 시간은 {delay}밀리초</p>;
}