当键是数字时,如何在JavaScript中对对象值进行排序？

Question

假设我有这样奇怪的代码:

var weirdo = {};
var ids = [10, 30, 11, 1, 4, 2];
var producers = ['Ford','Rover','BMW','Fiat','Renault','Mitsubishi'];
var n = producers.length;
for(var i=0; i<n; i++) {
    weirdo[ids[i]] = producers[i];
}
// unknown code ???

如何按值对怪物进行排序？它不是数组而不是,我不能在填充怪人之前对生产者进行排序.

有任何想法吗？

哦,关系id <=>制作人是非常重要的!

Answer 1

您可以使用对象数组:

var items = [
  {id:10, producer:'Ford'},
  {id:30, producer:'Rover'},
  {id:11, producer:'BMW'},
  {id:1, producer:'Fiat'},
  {id:4, producer:'Renault'},
  {id:2, producer:'Mitsubishi'},
]

// or, starting from your two arrays:
var items = [];
for (var i=0; i<ids.length && i<producers.length; i++)
    items[i] = {id:ids[i], producer:producers[i]};

然后你可以按 id 对该数组进行排序:

items.sort(function(a, b){ return a.id-b.id; });

...并使用for循环迭代它.

另一个解决方案是迭代器数组,以weirdo正确的顺序循环id < - > producer对象():

var weirdo = {"10":"Ford","30":"Rover",...};
var ids = Object.keys(weirdo); // if not already built somewhere

ids.sort(function(a,b){return a-b;}); // sort numeric
// loop:
for (var i=0; i<ids.length; i++) {
    var id=ids[i], producer=weirdo[id];
    ...
}