如果我有一个JavaScript对象,如:

var list = {
  "you": 100, 
  "me": 75, 
  "foo": 116, 
  "bar": 15
};

是否有一种方法可以根据值对属性进行排序?最后得到

list = {
  "bar": 15, 
  "me": 75, 
  "you": 100, 
  "foo": 116
};

当前回答

这可能是一种将其作为真实有序对象处理的简单方法。不知道它有多慢。也可能更好的while循环。

Object.sortByKeys = function(myObj){
  var keys = Object.keys(myObj)
  keys.sort()
  var sortedObject = Object()
  for(i in keys){
    key = keys[i]
    sortedObject[key]=myObj[key]
   }

  return sortedObject

}

然后我找到了这个逆函数 http://nelsonwells.net/2011/10/swap-object-key-and-values-in-javascript/

Object.invert = function (obj) {

  var new_obj = {};

  for (var prop in obj) {
    if(obj.hasOwnProperty(prop)) {
      new_obj[obj[prop]] = prop;
    }
  }

  return new_obj;
};

So

var list = {"you": 100, "me": 75, "foo": 116, "bar": 15};
var invertedList = Object.invert(list)
var invertedOrderedList = Object.sortByKeys(invertedList)
var orderedList = Object.invert(invertedOrderedList)

其他回答

谢谢你,继续回答@Nosredna

现在我们知道对象需要转换为数组,然后对数组排序。这对于按字符串排序数组(或转换对象为数组)非常有用:

Object {6: Object, 7: Object, 8: Object, 9: Object, 10: Object, 11: Object, 12: Object}
   6: Object
   id: "6"
   name: "PhD"
   obe_service_type_id: "2"
   __proto__: Object
   7: Object
   id: "7"
   name: "BVC (BPTC)"
   obe_service_type_id: "2"
   __proto__: Object


    //Sort options
    var sortable = [];
    for (var vehicle in options)
    sortable.push([vehicle, options[vehicle]]);
    sortable.sort(function(a, b) {
        return a[1].name < b[1].name ? -1 : 1;
    });


    //sortable => prints  
[Array[2], Array[2], Array[2], Array[2], Array[2], Array[2], Array[2]]
    0: Array[2]
    0: "11"
    1: Object
        id: "11"
        name: "AS/A2"
        obe_service_type_id: "2"
        __proto__: Object
        length: 2
        __proto__: Array[0]
    1: Array[2]
    0: "7"
    1: Object
        id: "7"
        name: "BVC (BPTC)"
        obe_service_type_id: "2"
        __proto__: Object
        length: 2

找不到上面的答案,既工作又小,并支持嵌套对象(不是数组),所以我写了自己的一个:)工作与字符串和整数。

  function sortObjectProperties(obj, sortValue){
      var keysSorted = Object.keys(obj).sort(function(a,b){return obj[a][sortValue]-obj[b][sortValue]});
      var objSorted = {};
      for(var i = 0; i < keysSorted.length; i++){
          objSorted[keysSorted[i]] = obj[keysSorted[i]];
      }
      return objSorted;
    }

用法:

    /* sample object with unsorder properties, that we want to sort by 
    their "customValue" property */

    var objUnsorted = {
       prop1 : {
          customValue : 'ZZ'
       },
       prop2 : {
          customValue : 'AA'
       }
    }

    // call the function, passing object and property with it should be sorted out
    var objSorted = sortObjectProperties(objUnsorted, 'customValue');

    // now console.log(objSorted) will return:
    { 
       prop2 : {
          customValue : 'AA'
       },
       prop1 : {
          customValue : 'ZZ'
       } 
    }

将它们移动到一个数组中,对该数组进行排序,然后将该数组用于您的目的。这里有一个解决方案:

let maxSpeed = {
    car: 300, 
    bike: 60, 
    motorbike: 200, 
    airplane: 1000,
    helicopter: 400, 
    rocket: 8 * 60 * 60
};
let sortable = [];
for (var vehicle in maxSpeed) {
    sortable.push([vehicle, maxSpeed[vehicle]]);
}

sortable.sort(function(a, b) {
    return a[1] - b[1];
});

// [["bike", 60], ["motorbike", 200], ["car", 300],
// ["helicopter", 400], ["airplane", 1000], ["rocket", 28800]]

有了数组之后,就可以按照自己喜欢的顺序从数组重新构建对象,从而完全实现您想要做的事情。这在我所知道的所有浏览器中都可以工作,但它将依赖于一个实现的怪癖,并且随时可能崩溃。永远不要假设JavaScript对象中元素的顺序。

let objSorted = {}
sortable.forEach(function(item){
    objSorted[item[0]]=item[1]
})

在ES8中,你可以使用object .entries()将对象转换为数组:

const maxSpeed = { 车:300, 自行车:60岁 摩托车:200, 飞机:1000, 直升机:400, 火箭:8 * 60 * 60 }; const sortable = Object.entries(maxSpeed) .sort([,a],[,b]) => a-b) .reduce((r, [k, v]) =>({…R, [k]: v}), {}); console.log(合适的);


在ES10中,你可以使用object. fromentries()将数组转换为对象。然后代码可以简化为:

const maxSpeed = { 车:300, 自行车:60岁 摩托车:200, 飞机:1000, 直升机:400, 火箭:8 * 60 * 60 }; const sortable = Object.fromEntries( Object.entries(maxSpeed).sort(([,a],[,b]) => a-b) ); console.log(合适的);

我遵循slebetman给出的解决方案(去阅读它的所有细节),但调整,因为你的对象是非嵌套的。

// First create the array of keys/values so that we can sort it:
var sort_array = [];
for (var key in list) {
    sort_array.push({key:key,value:list[key]});
}

// Now sort it:
sort_array.sort(function(x,y){return x.value - y.value});

// Now process that object with it:
for (var i=0;i<sort_array.length;i++) {
    var item = list[sort_array[i].key];

    // now do stuff with each item
}
var list = {
    "you": 100, 
    "me": 75, 
    "foo": 116, 
    "bar": 15
};

function sortAssocObject(list) {
    var sortable = [];
    for (var key in list) {
        sortable.push([key, list[key]]);
    }
    // [["you",100],["me",75],["foo",116],["bar",15]]

    sortable.sort(function(a, b) {
        return (a[1] < b[1] ? -1 : (a[1] > b[1] ? 1 : 0));
    });
    // [["bar",15],["me",75],["you",100],["foo",116]]

    var orderedList = {};
    for (var idx in sortable) {
        orderedList[sortable[idx][0]] = sortable[idx][1];
    }

    return orderedList;
}

sortAssocObject(list);

// {bar: 15, me: 75, you: 100, foo: 116}