this.store = new Ext.data.JsonStore({
                            url : "/work/listWork.do",
                            root : "result",
                            totalProperty : "totalCounts",
                            remoteSort : true,
                            idProperty : "userId",//通过两张表相同字段筛选唯一记录
                            fields : [{
                                        name : "workId",//work表主键字段
                                        type : "int"
                                    }, "user"]//user表
                        });

app.ux.AggregateStore=Ext.extend(Ext.data.GroupingStore,{
    summaryField:null,
    constructor:function(config){
        Ext.apply(this,config);
        
        app.ux.AggregateStore.superclass.constructor.call(this);
        this.on('load',this.aggregate,this);
    },
    aggregate:function(){
        var rec=null;
        
        this.each(function(record){
            if(rec==null||rec.data[this.groupField]!=record.data[this.groupField]){
                /////针对特定项目的处理
                if(record.data.salePrice==undefined||record.data.salePrice==0){
                    record.data.salePrice=record.data.price;
                }
                record.data.profit=(record.data.salePrice-record.data.price)*record.data.quantity;
                //////////通用代码
                rec=record;
                return;
            }
            
            if(rec.data[this.groupField]==record.data[this.groupField]){
                /////针对特定项目的处理
                var currentTotal=record.data.total;
                record.data.profit=(record.data.salePrice-record.data.price)*record.data.quantity;
                record.data.profit+=rec.data.profit;
                record.data[this.summaryField]+=rec.data[this.summaryField];
                record.data.quantity+=rec.data.quantity;
                /////////////通用代码
                this.remove(rec);
                rec=record;
                
                
            }
            
        },this);