求助—Jquery easyui 内嵌iframe的取值

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如下面代码包含在页面中 用的easyui window 我想在当前页面取框架页iframeUpload的某个div 的值 要怎么做
<div id="winUploadFiles" class="easyui-window" title="添加文件" minimizable="false" closed="true" style=" width:600px;height:300px;padding:0px;">
<div class="easyui-layout" data-options="fit:true">
<div data-options="region:'center'" style="padding:0px;" width='100%' height='100%' >
<iframe id="iframeUpload" scrolling='auto' src="xdUploadFiles.aspx" width='100%' height='100%' frameborder='0'></iframe>
</div>

</div>