项目需要在JS中动态加载JS文件，正好搜到一篇文章，先放这，然后去测一下：
<script language=javascript>
 2         
 3         function JSandCSSRegistration()
 4         {            
 5             document.createStyleSheet("style.css");
 6             var head = document.getElementsByTagName('HEAD').item(0);
 7             var script = document.createElement('SCRIPT');
 8             script.src = "common.js";
 9             script.type = "text/javascript";
10             head.appendChild(script);
11         }
12         
13         JSandCSSRegistration();
14         </script>    

来源：http://www.cnblogs.com/bestcomy/archive/2005/11/05/263191.html