<script type="text/javascript" src="extjs/ext-all-debug.js"></script>
<script type="text/javascript"
src="extjs/adapter/ext/ext-base-debug.js"></script>
<script type="text/javascript" src="extjs/ext-all.js"></script>
<link rel="stylesheet" href="extjs/resources/css/ext-all.css"
type="text/css"></link>
<script type="text/javascript">
Ext.onReady(function(){
alert("aaaaaaaa");
new Ext.Panel({
renderTo:'h22',
title;'SHOW',
width:300,
height:300,
html:'Hello,So easy!',
tools:[
{id:'save'},
{id:'help',handler:function(){Ext.Msg.alert('help','help!!!');}},
{id:'close'}
],
tbar:[{prssed:true,text:'刷新'}]
});
});</script>
<div id="h22"></div>
------解决方案--------------------
没有引用到Ext的文件。