https://blog.csdn.net/weixin_40648180/article/details/79867875 

<link rel="stylesheet" type ="text/css" href="../../resources/css/ext-all.css" />  
<script type ="text/javascript" src="../../ext-all.js"></script>
<script>
   Ext.onReady(function(){
     Ext.MessageBox.alert('Hll','asdfsa');
    });
</script>

  

1】其中，resources/css/ext-all.css，为样式，必须 否则样式错位

 

 2】ext-all.js包含所有功能