匿名Mask Window
示例：
代码：
<div style="margin:20px 0;">
<a href="javascript:void(0)" class="easyui-linkbutton" onclick="$('#w').window('open')">Open</a>
<a href="javascript:void(0)" class="easyui-linkbutton" onclick="$('#w').window('close')">Close</a>
</div>
<div id="w" class="easyui-window" title="Basic Window" data-options="iconCls:'icon-save'" style="width:500px;height:200px;padding:10px;">
The window content.
</div>