如何将关联数组转换为已排序的字符串数组？

Question

我该如何转换这个js对象

 var obj1 =  {"user1":28, "user2":87, "user3":56};

到一个字符串数组,按值排序,如下所示:

["user2","user3","user1"]

Answer 1

用这个:

var obj1 =  {"user1":28, "user2":87, "user3":56};
var a = Object.keys(obj1).sort(function(x,y){return obj1[y]-obj1[x]})
console.log(a);

输出:

["user2", "user3", "user1"]