如何把服务器端返回的json数据与extjs组件的渲染器函数(renderer)关联起来？

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如何把服务器端返回的json数据与extjs组件的渲染器函数(renderer)关联起来？0

1.服务器端代码
private <T extends IOrderSupported> String service(IOrderService<T> svc, T form, String error) throws Exception{
		SalesOrder var=OrderMngr.get(form.getOrdId());
		if(isAuthorized(var)){
			svc.service(var, form, request);
			json=JsonEncodeType.OBJECT.encode(var);
			return SUCCESS;
		}
		return error;
	}

2.  js代码
//如果客户留言，则添加html代码；如果ppet留言，则不添加html代码
function renderLastUpdate(val,x,store){ 
    var r=renderers.lastUpdate(val,x,store);
    if(store.data.userType=="C"){
        r+="<br/><img src='/img/new2_4.gif' title='New remark'/>";
    }
    
    return r;
}
var columns=[
	{header: "流水号",dataIndex: "ordId",hidden:true},
	{header: "订单号",dataIndex: "orderNo",renderer:renderCode,sortable:true},
	{header: "国家",dataIndex: "nation"},
	{header: "客户号",dataIndex: "custId",hidden:true},
	{header: "客户",dataIndex: "custCode"},
	{header: "客户名称",dataIndex: "custName",hidden:true},
	{header: "客户类别",dataIndex: "custCate",hidden:true,renderer:renderCate},
	{header: "货币",dataIndex: "currency"},
	{header: "汇率",dataIndex: "crRate", renderer: Ext.util.Format.numberRenderer('0,0.00'),hidden:true},
	{header: "日期格式",dataIndex: "dateFormat",hidden:true},
	{header: "联系人",dataIndex: "linkman"},
	{header: "状态",dataIndex: "status", renderer:renderState},
	{header: "数量",dataIndex: "qty"},
	{header: "净金额",dataIndex: "netAmount", renderer: Ext.util.Format.numberRenderer('0,0.00')},
	{header: "附加费用",dataIndex: "additionalCost", renderer: Ext.util.Format.numberRenderer('0,0.00'),hidden:true},
	{header: "运费",dataIndex: "deliCost", renderer: Ext.util.Format.numberRenderer('0,0.00'),hidden:true},
	{header: "退款订单",dataIndex: "retOrderNo",hidden:true},
	{header: "退款额",dataIndex: "retCharge", renderer: Ext.util.Format.numberRenderer('0,0.00'),hidden:true},
	{header: "折扣",dataIndex: "discountAmount", renderer: Ext.util.Format.numberRenderer('0,0.00'),hidden:true},
	{header: "总金额",dataIndex: "amount", renderer: Ext.util.Format.numberRenderer('0,0.00')},
	{header: "备注",dataIndex: "remarks"},
	{header: "订单日期",dataIndex: "orderDate", renderer: Ext.util.Format.dateRenderer('Y-m-d')},
	{header: "下单者",dataIndex: "issuer"},
	{header: "编辑者",dataIndex: "editor",hidden:true},
	//{header: "最近更新",dataIndex: "lastUpdate", renderer: Ext.util.Format.dateRenderer('Y-m-d H:i:s'), sortable:true},
	{header: "最近更新",dataIndex: "lastUpdate", renderer: renderLastUpdate, sortable:true}, //1.表格面板的列：添加渲染器(函数)
	{header: "删除",dataIndex: "ordId",hidden:true,renderer:renderers.erase}
];

-----------------
【问题】
1.var实体对象和json对象的userType属性都有值；
2.现在就是，属性的值《——》面板表格的值，这2者怎么关联起来呢？(渲染器函数不是自动执行的么)

补充：
1.

function renderLastUpdate(val,x,store){   //【调试时】当java代码执行完毕，js里设置的断点都没有执行？

var r=renderers.lastUpdate(val,x,store);

    if(store.data.userType=="C"){
        r+="<br/><img src='/img/new2_4.gif' title='New remark'/>";
    }

    return r;
}

2.如果只是单独设置js代码里的断点：当刷新后台相应的页面时，下面代码里的判断语句始终是假，也就是说服务器端的json对象的数据没有映射到store.data.userType，如何才能映射呢？

function renderLastUpdate(val,x,store){
    var r=renderers.lastUpdate(val,x,store);
    if(store.data.userType=="C"){ //1.执行到这一行的时候，判断语句始终为假
        r+="<br/><img src='/img/new2_4.gif' title='New remark'/>";
    }

    return r;
}

(截图：面板的最后一列~)