Order Json object based on the values

Question

Here down a snippet of my program:

var items = {"43":"1255","44":"1243","45":"8080","46":"9898"};
var result = Object.keys(items).map(function(e) {
    return [items[e],Number(e)];
});
console.log(result);

I would need to order the items based on the values so to have an output JSON as below:

{
    "44":"1243",
    "43":"1255",
    "45":"8080",
    "46":"9898"
};