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<div id="back-to-top" class="back-to-top">
<i class="icon-arrow-up"></i>
</div>
<script>
const backToTop = document.getElementById('back-to-top');
// 显示/隐藏回到顶部按钮
window.addEventListener('scroll', () => {
if (window.pageYOffset > 300) {
backToTop.classList.add('show');
} else {
backToTop.classList.remove('show');
}
});
// 点击回到顶部
backToTop.addEventListener('click', () => {
window.scrollTo({
top: 0,
behavior: 'smooth'
});
});
</script>
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