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效果显示：
代码：
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Hello Extjs4.2</title>
<link href="../ExtJS4.2/resources/css/ext-all-neptune.css" rel="stylesheet">
<!-- <script src="../ExtJS4.2/locale/ext-lang-zh_CN.js"></script> -->
<script src="../ExtJS4.2/ext-all.js"></script>
<script type="text/javascript">
Ext.onReady(function(){
new Ext.Panel({
renderTo:"hello",
title:"面板头部header",
width:300,
height:200,
html:'<h1>面板主区域</h1>',
tbar:[{text:'顶部工具栏topToolbar'}],
bbar:[{text:'底部工具栏bottomToolbar'}],
buttons:[{text:"按钮位于footer"}]
});
});
</script>
</head>
<body>
<div id="hello"></div>
</body>
</html>
