在网站页面右下角添加一个“回到顶部”的按钮，手机和电脑通用，通过CSS加JavaScript即可实现，代码如下：
css/js
#backToTop { position: fixed !important; right: 20px !important; bottom: 25px !important; width: 42px !important; height: 42px !important; line-height: 42px !important; font-size: 18px !important; background: #222 !important; color: #fff !important; border-radius: 50% !important; text-align: center !important; cursor: pointer !important; z-index: 99999 !important; opacity: 0 !important; visibility: hidden !important; transition: all 0.3s ease !important; } #backToTop.show { opacity: 1 !important; visibility: visible !important; } #backToTop:hover { background: #007cba !important; } <div id="backToTop">↑</div> <script> const backToTopBtn = document.getElementById('backToTop'); window.addEventListener('scroll', function(){ if (window.scrollY > 150) { backToTopBtn.classList.add('show'); } else { backToTopBtn.classList.remove('show'); } }); backToTopBtn.addEventListener('click', function(){ window.scrollTo({top:0,behavior:'smooth'}); }); </script>
