JavaScript는 페이지에서 부드러운 스크롤을 어떻게 구현합니까?

<button onclick="smoothScroll('#section2')">Scroll to Section 2</button>

function smoothScroll(target) {
  const targetElement = document.querySelector(target);
  const targetPosition = targetElement.offsetTop;
  const startPosition = window.pageYOffset;
  const distance = targetPosition - startPosition;
  const duration = 1000;  // 滚动持续时间，单位为毫秒
  let startTimestamp = null;

  function scrollAnimation(timestamp) {
    if (!startTimestamp) startTimestamp = timestamp;
    const progress = timestamp - startTimestamp;
    window.scrollTo(0, easeInOutQuad(progress, startPosition, distance, duration));
    if (progress < duration) {
      requestAnimationFrame(scrollAnimation);
    }
  }

  function easeInOutQuad(t, b, c, d) {
    t /= d / 2;
    if (t < 1) return c / 2 * t * t + b;
    t--;
    return -c / 2 * (t * (t - 2) - 1) + b;
  }

  requestAnimationFrame(scrollAnimation);
}

section {
  height: 100vh;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
}