匿名Group ComboBox
This example shows how to display combobox items in groups.
示例：
代码：
<div style="margin:20px 0">
<input type="checkbox" onchange="$('#cc').combobox({groupPosition:$(this).is(':checked')?'sticky':'static'})">
<span>Sticky Group</span>
</div>
<div class="easyui-panel" style="width:100%;max-width:400px;padding:30px 60px;">
<div style="margin-bottom:20px">
<input id="cc" class="easyui-combobox" name="browser" style="width:100%;" data-options="
url: 'examples/combobox/combobox_data2.json',
method: 'get',
valuefield:'value',
textfield:'text',
groupfield:'group',
label: 'browser:',
labelposition: 'top'
">
</div>
</div>