var helper = {
　　sort:function(data){ //｛“20141216”：｛｝，“20141217”：｛｝｝按大小排序,        var arr1 = [],arr2=[],self = this;        for(var key in data){            arr1.push(key);        }        arr1.sort();        for(var i=0;i<arr1.length;i++){            var date = arr1[i];            var o = self._clone(data[date]);            o.date = arr1[i];            o.flag = o.hasOwnProperty(‘img‘);            arr2.push(o);        }        return arr2;    }

}