Extjs 分页删除 跳转前一页

   if(this.getStore().getCount()==1)//如果当前store的数据记录数等于1那么就从服务器端加载数据，否则从store中删除选定的Record
                {
                    var cursor=this.getBottomToolbar().cursor;
                    var start=this.getBottomToolbar().cursor-this.getBottomToolbar().pageSize;
                    var pageSize=this.getBottomToolbar().pageSize;
                    this.getStore().load({params:{start:start,limit:pageSize}});
                    return;
                }
                this.getStore().remove(this.getSelectionModel().getSelected()) ;
//                var cursor=this.getBottomToolbar().cursor;
//                this.getStore().load({params:{start:cursor-1,limit:this.getBottomToolbar().pageSize}});
            },