返回顶部

主要代码 
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<!-- css -->
<style type="text/css">
#totop {
  position: fixed;
  bottom: 3em;
  right: 1em;
  cursor: pointer;
}
</style>
<!-- include javascript -->
<script src="assets/js/jquery-1.11.2.min.js"></script>
<!-- html -->
<div id="totop" style="display: block; opacity: 1;">
    <a title="返回顶部"><img src="assets/images/scrollup.png"></a>
</div>
<!-- include javascript -->
<script src="assets/js/totop.js"></script>