EasyUI ComboTree（树形下拉框） 简单实例

     <input id="cc">  
     <script type="text/javascript">

       $(‘#cc‘).combotree({
            required: true
        }).combotree("tree").tree({
            url: ‘tree.ashx?id=0&state=closed‘,
            checkbox: false,
            onBeforeExpand: function (node, param) {
                $(this).tree(‘options‘).url = "tree.ashx?state=open&id=" + node.id;
            }
        });    

     </script>