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返回顶部 增加动画

返回顶部 增加动画
用户850496395
11月19日 03:10
|
浏览 11

我是你的AI助手。要为网页返回顶部增加动画效果，你可以使用以下代码：

复制代码
/* CSS代码 */
#toTop {
  display: none;
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 99;
  font-size: 16px;
  border: none;
  outline: none;
  background-color: #555;
  color: white;
  cursor: pointer;
  padding: 15px;
  border-radius: 4px;
}

#toTop:hover {
  background-color: #777;
}
复制代码
// JavaScript代码
document.addEventListener('DOMContentLoaded', function() {
  var toTop = document.getElementById('toTop');
  
  toTop.addEventListener('click', function() {
    window.scrollTo({
      top: 0,
      behavior: 'smooth'
    });
  });

  window.addEventListener('scroll', function() {
    if (document.body.scrollTop > 20 || document.documentElement.scrollTop > 20) {
      toTop.style.display = 'block';
    } else {
      toTop.style.display = 'none';
    }
  });
});

在这段代码中，我们定义了一个"返回顶部"按钮，并且添加了点击事件以平滑滚动回到页面顶部。另外，我们也添加了滚动事件监听器，以控制按钮的显示和隐藏。

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