加入<body></body>之间，否则报错
浮动模式
<!-- JiaThis Button BEGIN --> <script type="text/javascript" src=" http://v1.jiathis.com/code/jiathis_r.js" charset="utf-8"></script> <!-- JiaThis Button END -->
固定
<!-- JiaThis Button BEGIN -->
<script type="text/javascript" src="http://v1.jiathis.com/code/jiathis_r.js?move=0" charset="utf-8"></script>
<!-- JiaThis Button END -->