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"]