匿名Nested Panel
The panel can be placed inside containers and can contain other components.
示例：
代码：
<div class="easyui-panel" title="Nested Panel" style="width:700px;height:200px;padding:10px;">
<div class="easyui-layout" data-options="fit:true">
<div data-options="region:'west',split:true" style="width:100px;padding:10px">
Left Content
</div>
<div data-options="region:'east'" style="width:100px;padding:10px">
Right Content
</div>
<div data-options="region:'center'" style="padding:10px">
Center Content
</div>
</div>
</div>