我使用AJAX获取了以下对象,并将它们存储在数组中:

var homes = [
    {
        "h_id": "3",
        "city": "Dallas",
        "state": "TX",
        "zip": "75201",
        "price": "162500"
    }, {
        "h_id": "4",
        "city": "Bevery Hills",
        "state": "CA",
        "zip": "90210",
        "price": "319250"
    }, {
        "h_id": "5",
        "city": "New York",
        "state": "NY",
        "zip": "00010",
        "price": "962500"
    }
];

如何创建一个函数,仅使用JavaScript按price属性按升序或降序对对象进行排序?


当前回答

我推荐GitHub:ArraysortBy-使用Schwartzian变换的sortBy方法的最佳实现

但现在我们将尝试这种方法Gist:sortBy-old.js。让我们创建一个方法来对数组进行排序,以便能够按某种属性排列对象。

创建排序功能

var sortBy = (function () {
  var toString = Object.prototype.toString,
      // default parser function
      parse = function (x) { return x; },
      // gets the item to be sorted
      getItem = function (x) {
        var isObject = x != null && typeof x === "object";
        var isProp = isObject && this.prop in x;
        return this.parser(isProp ? x[this.prop] : x);
      };
      
  /**
   * Sorts an array of elements.
   *
   * @param  {Array} array: the collection to sort
   * @param  {Object} cfg: the configuration options
   * @property {String}   cfg.prop: property name (if it is an Array of objects)
   * @property {Boolean}  cfg.desc: determines whether the sort is descending
   * @property {Function} cfg.parser: function to parse the items to expected type
   * @return {Array}
   */
  return function sortby (array, cfg) {
    if (!(array instanceof Array && array.length)) return [];
    if (toString.call(cfg) !== "[object Object]") cfg = {};
    if (typeof cfg.parser !== "function") cfg.parser = parse;
    cfg.desc = !!cfg.desc ? -1 : 1;
    return array.sort(function (a, b) {
      a = getItem.call(cfg, a);
      b = getItem.call(cfg, b);
      return cfg.desc * (a < b ? -1 : +(a > b));
    });
  };
  
}());

设置未排序的数据

var data = [
  {date: "2011-11-14T16:30:43Z", quantity: 2, total: 90,  tip: 0,   type: "tab"},
  {date: "2011-11-14T17:22:59Z", quantity: 2, total: 90,  tip: 0,   type: "Tab"},
  {date: "2011-11-14T16:28:54Z", quantity: 1, total: 300, tip: 200, type: "visa"},
  {date: "2011-11-14T16:53:41Z", quantity: 2, total: 90,  tip: 0,   type: "tab"},
  {date: "2011-11-14T16:48:46Z", quantity: 2, total: 90,  tip: 0,   type: "tab"},
  {date: "2011-11-14T17:25:45Z", quantity: 2, total: 200, tip: 0,   type: "cash"},
  {date: "2011-11-31T17:29:52Z", quantity: 1, total: 200, tip: 100, type: "Visa"},
  {date: "2011-11-14T16:58:03Z", quantity: 2, total: 90,  tip: 0,   type: "tab"},
  {date: "2011-11-14T16:20:19Z", quantity: 2, total: 190, tip: 100, type: "tab"},
  {date: "2011-11-01T16:17:54Z", quantity: 2, total: 190, tip: 100, type: "tab"},
  {date: "2011-11-14T17:07:21Z", quantity: 2, total: 90,  tip: 0,   type: "tab"},
  {date: "2011-11-14T16:54:06Z", quantity: 1, total: 100, tip: 0,   type: "Cash"}
];

使用它

按字符串形式的“日期”排列数组

// sort by @date (ascending)
sortBy(data, { prop: "date" });

// expected: first element
// { date: "2011-11-01T16:17:54Z", quantity: 2, total: 190, tip: 100, type: "tab" }

// expected: last element
// { date: "2011-11-31T17:29:52Z", quantity: 1, total: 200, tip: 100, type: "Visa"}

如果要忽略区分大小写,请设置解析器回调:

// sort by @type (ascending) IGNORING case-sensitive
sortBy(data, {
    prop: "type",
    parser: (t) => t.toUpperCase()
});

// expected: first element
// { date: "2011-11-14T16:54:06Z", quantity: 1, total: 100, tip: 0, type: "Cash" }

// expected: last element
// { date: "2011-11-31T17:29:52Z", quantity: 1, total: 200, tip: 100, type: "Visa" }

如果要将“日期”字段转换为日期类型:

// sort by @date (descending) AS Date object
sortBy(data, {
    prop: "date",
    desc: true,
    parser: (d) => new Date(d)
});

// expected: first element
// { date: "2011-11-31T17:29:52Z", quantity: 1, total: 200, tip: 100, type: "Visa"}

// expected: last element
// { date: "2011-11-01T16:17:54Z", quantity: 2, total: 190, tip: 100, type: "tab" }

在这里,您可以使用代码:jsbin.com/lesebi网站

由于@Ozesh的反馈,与具有虚假值的财产相关的问题得到了解决。

其他回答

虽然我知道OP想要对一组数字进行排序,但这个问题已经被标记为字符串相关类似问题的答案。事实上,上面的答案没有考虑对大小写很重要的文本数组进行排序。大多数答案采用字符串值并将其转换为大写/小写,然后以某种方式进行排序。我遵守的要求很简单:

按字母顺序A-Z排序同一单词的大写值应在小写值之前应将相同字母(A/A、B/B)的值分组在一起

我期望的是[A,A,B,B,C,C],但上面的答案返回A,B,C,A,B,C。实际上,我在这个问题上花了比我想要的时间更长的时间(这就是为什么我发布这个消息,希望它能帮助至少一个人)。虽然两个用户在注释中提到了localeCompare函数,但直到我在四处搜索时偶然发现了该函数之后,我才发现这一点。在阅读了String.product.localeCompare()文档后,我想到了这个:

var values = [ "Delta", "charlie", "delta", "Charlie", "Bravo", "alpha", "Alpha", "bravo" ];
var sorted = values.sort((a, b) => a.localeCompare(b, undefined, { caseFirst: "upper" }));
// Result: [ "Alpha", "alpha", "Bravo", "bravo", "Charlie", "charlie", "Delta", "delta" ]

这告诉函数在小写值之前对大写值进行排序。localeCompare函数中的第二个参数是定义语言环境,但如果您将其保留为未定义,它会自动为您计算语言环境。

这同样适用于对对象数组进行排序:

var values = [
    { id: 6, title: "Delta" },
    { id: 2, title: "charlie" },
    { id: 3, title: "delta" },
    { id: 1, title: "Charlie" },
    { id: 8, title: "Bravo" },
    { id: 5, title: "alpha" },
    { id: 4, title: "Alpha" },
    { id: 7, title: "bravo" }
];
var sorted = values
    .sort((a, b) => a.title.localeCompare(b.title, undefined, { caseFirst: "upper" }));
 function compareValues(key, order = 'asc') {
  return function innerSort(a, b) {
    if (!a.hasOwnProperty(key) || !b.hasOwnProperty(key)) {
      // property doesn't exist on either object
      return 0;
    }

    const varA = (typeof a[key] === 'string')
      ? a[key].toUpperCase() : a[key];
    const varB = (typeof b[key] === 'string')
      ? b[key].toUpperCase() : b[key];

    let comparison = 0;
    if (varA > varB) {
      comparison = 1;
    } else if (varA < varB) {
      comparison = -1;
    }
    return (
      (order === 'desc') ? (comparison * -1) : comparison
    );
  };
}

http://yazilimsozluk.com/sort-array-in-javascript-by-asc-or-desc

可以使用string1.localeCompare(string2)进行字符串比较

this.myArray.sort((a,b) => { 
    return a.stringProp.localeCompare(b.stringProp);
});

注意localCompare不区分大小写

您可以将JavaScript排序方法与回调函数一起使用:

function compareASC(homeA, homeB)
{
    return parseFloat(homeA.price) - parseFloat(homeB.price);
}

function compareDESC(homeA, homeB)
{
    return parseFloat(homeB.price) - parseFloat(homeA.price);
}

// Sort ASC
homes.sort(compareASC);

// Sort DESC
homes.sort(compareDESC);

你想用Javascript对它进行排序,对吗?您需要的是sort()函数。在这种情况下,您需要编写一个比较器函数,并将其传递给sort(),因此如下所示:

function comparator(a, b) {
    return parseInt(a["price"], 10) - parseInt(b["price"], 10);
}

var json = { "homes": [ /* your previous data */ ] };
console.log(json["homes"].sort(comparator));

比较器从数组中的每一个嵌套散列中选取一个,并通过检查“price”字段来决定哪个散列更高。