1.css样式 :
<style> #topBtn { position: fixed; bottom: 380px; right: 50px; width: 60px; height: 60px; line-height: 60px; text-align: center; color: #FFF; z-index: 999; background: #FF5722; cursor: pointer; border-radius: 30px; box-shadow: 0px 0px 20px #000; } </style>
3.html 代码:
<div id="topBtn">置顶</div>