如何在使用按钮滚动后返回到活动的顶部？

// HTML
<button id="scrollToTopBtn">返回顶部</button>

// JavaScript
const scrollToTopBtn = document.getElementById('scrollToTopBtn');

scrollToTopBtn.addEventListener('click', () => {
  window.scrollTo({
    top: 0,
    behavior: 'smooth'
  });
});

/* CSS */
html {
  scroll-behavior: smooth;
}

<!-- HTML -->
<button onclick="scrollToTop()">返回顶部</button>

// JavaScript
function scrollToTop() {
  window.scrollTo({
    top: 0,
    behavior: 'smooth'
  });
}

<!-- HTML -->
<button id="scrollToTopBtn">返回顶部</button>

// JavaScript
$('#scrollToTopBtn').click(function() {
  $('html, body').animate({ scrollTop: 0 }, 'slow');
});