EXT在火狐中不好使 为什么啊。。。求围观！

Question

 <script type="text/javascript" src="interface/javascript/ext-3.3.0/adapter/ext/ext-base.js"></script>
    <script type="text/javascript" src="interface/javascript/ext-3.3.0/ext-all.js"></script>
  <script type="text/javascript" src="interface/javascript/ext-3.3.0/ext-all-debug.js"></script>
    <script type="text/javascript">  
        Ext.onReady(function(){
         Ext.Msg.alert();
        });   
    </script> 
就这样就挂了饿。求解释  求围观 求帮忙

Answer 1

 <script type="text/javascript" src="interface/javascript/ext-3.3.0/ext-all.js"></script>
  <script type="text/javascript" src="interface/javascript/ext-3.3.0/ext-all-debug.js"></script>
你搞两个干啥，留下debug版本的就可以了