分享一个曾经自用的返回顶部按钮代码，可用于个人主页：
第一步引入JS和CSS文件：
<link rel="stylesheet" type="text/css" media="screen" href="https://www.huawenonline.com/css/top.css" />
css内容：
#returnTop {
_display:none;
position:fixed;
_position:absolute;
z-index:999;
right:15px;
bottom:-200px;
_bottom:auto;
width:36px;
height:65px;
text-indent:-999px;
overflow:hidden;
background-image:url(/img/Top.png);
_background-image:url(/img/Top.png);
background-repeat:no-repeat;
background-position:0 0;
transition:bottom 0.9s;
-webkit-transition:bottom 0.9s;
-moz-transition:bottom 0.9s;
-o-transition:bottom 0.9s;
}
#returnTop:hover {
background-position:0 -65px;
}
<script type="text/javascript" src="https://www.huawenonline.com/js/top.js"></script>" />
