//获取冻结的数据源并返回key,value格式数据
 var GetFrozeData = function (gridStr, isFroze) {
     //获取所有未冻结列数据
     var cols = $(gridStr).datagrid('getColumnFields', isFroze);
     var array = [];
     for (var i in cols) {     
         //获取每一列的列名对象
         var col = $(gridStr).datagrid("getColumnOption", cols[i]);
         //声明对象
         var obj = new Object();
         obj["value"] = cols[i];
         obj["text"] = col.title.trim();
         //追加对象
         array.push(obj);
     }   
     return array;
 }

 //加载combobox数据源
 var LoadComboData = function (gridStr, comboStr, isFroze) {      
    //获取冻结或非冻结列名，转成key，val 格式
     var comboData = GetFrozeData(gridStr,isFroze);        
    //重新绑定combo数据源  
     $(comboStr).combobox({ data: comboData });
    //$(comboStr).combobox('loadData', comboData);
 }  

    <div>
    <div id="setDiv" style="margin-top: 25px;">
        <a id="btnText" href="#" class="easyui-linkbutton" data-options="iconCls:'icon-add',plain:true" data-bind="click:showOrHideClick">高级设置</a>
    </div>
    <div class="clear"></div>
    <div id="frozeDiv">
        <div class="grid_1 lbl">冻结列：</div>
        <div class="grid_2 val"><input type="text" id="frozeCols" data-bind="comboboxValue:form.FrozeColoumn" data-options="multiple:true" class="z-txt easyui-combobox " /></div>
        <div class="clear"></div>
        <a id="a_search" href="#" class="buttonHuge button-blue" style="margin:5px 1%;" data-bind="click:saveSetClick">保存设置</a>
    </div>
   </div> 

    //显示或隐藏div事件
        var showOrHideClick = function(){ 
            //取到linkbutton按钮的显示值
            if($("#btnText").linkbutton("options").text == "高级设置"){
                //更换linkbutton图标，显示值
                $('#btnText').linkbutton({ iconCls: 'icon-remove' });
                $("#btnText").linkbutton({text: '隐藏'});                 
                // $('#frozeDiv').attr("style","display:none;");     //隐藏div
            }
            else{
                //更换linkbutton图标
                $('#btnText').linkbutton({ iconCls: 'icon-add' });
                $("#btnText").linkbutton({text: '高级设置'});                  
                //  $('#frozeDiv').attr("style","display:block;");   //显示div
            }
            //显示或隐藏div的jq事件
            $("#frozeDiv").toggle(500); 
            
            //加载combobox的数据源    
            LoadComboData("#gridlist","#frozeCols",false);  
        };