对象key值排序,以key值（数字）大小顺序遍历属性，helper._sort()

var helper = {
　　_sort:function(data){ //｛“20141216”：｛｝，“20141217”：｛｝｝按大小排序,
        var arr1 = [],arr2=[];
        for(var key in data){
            arr1.push(key);
        }
        arr1.sort(function(a,b){return a-b});
        for(var i=0;i<arr1.length;i++){
            arr2.push(data[arr1[i]]);
        }
        return arr2;
    }
}
var obj = {
    "12":"txt12",
    "13":"txt13",
    "4":"txt4",
    "9":"txt9",
    '01':'txt01',
    '05':'txt05'
}
console.log(helper._sort(obj)) //["txt01", "txt4", "txt05", "txt9", "txt12", "txt13"]