//创建数据存储对象
    var createStore = function( store,treeId){
        var ds=new Ext.data.Store({ 
                proxy:createProxy(treeId),
                reader:new Ext.data.JsonReader({
                    totalProperty:'totalProperty',
                    root:'root'},
                    store),
                paramNames:{
                    start : "start",
                    limit : "limit",
                    sort : "sort"
                }    
        }); 
        return ds;
    }


        //创建表格底部工具条
    var createBBar = function(tempStore,bbarItems){
        var bbar = new Ext.PagingToolbar({ 
            pageSize:18, 
            store: tempStore, 
            displayInfo:true, 
            items:bbarItems,
            displayMsg:'显示第{0}条到{1}条记录,一共{2}条', 
            emptyMsg:"没有记录" 
        })
        addClickEventBybbar(bbar);
        return bbar;
    }