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

function sortByProperty(home){
    return home.price
}

sortByProperty按价格获取属性。将来,您可能希望按“zip”或字符串值“city”对数据进行排序。您需要在上面的函数中更改home.price

// if you want descending order change this to false
// if you are on react.js you could set this with useState
const ascending=true
// Initially "b" is the index-1 item and "a" is the index-0 item
homes.sort((a,b)=>{
     //initially 0th index
     const first=sortByProperty(a)
     // initially 1st index 
     const second=sortByProperty(b)
     
     // if you multiply by -1 it will be descending 
     const sortOrder=ascending ? 1 : -1
     if (typeof first==="number"){
            return (first-second) * sortOrder
    } else {
           // this will compare the string values
           return (first.localeCompare(second)) * sortOrder
    }
})

其他回答

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。

按价格升序排序:

homes.sort(function(a, b) {
    return parseFloat(a.price) - parseFloat(b.price);
});

或ES6版本之后:

homes.sort((a, b) => parseFloat(a.price) - parseFloat(b.price));

这里可以找到一些文档。

对于降序,可以使用

homes.sort((a, b) => parseFloat(b.price) - parseFloat(a.price));

你需要两个功能

function desc(a, b) {
 return b < a ? -1 : b > a ? 1 : b >= a ? 0 : NaN;
}

function asc(a, b) {
  return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;
}

然后可以将其应用于任何对象属性:

 data.sort((a, b) => desc(parseFloat(a.price), parseFloat(b.price)));

让数据=[{label:“一”,值:10},{label:“two”,值:5},{label:“three”,值:1},];//排序函数函数desc(a,b){返回b<a-1:b>a?1:b>=a?0:NaN;}函数asc(a,b){返回a<b-1:a>b?1:a>=b?0:NaN;}//描述(DESC)data.sort((a,b)=>desc(a.value,b.value));document.body.insert相邻HTML('之前','<strong>DESC排序</strong><pre>'+JSON.stringify(数据)+'</pre>');//美国科学院data.sort((a,b)=>asc(a.value,b.value));document.body.insert相邻HTML('之前','<strong>ASCending sorted</strong><pre>'+JSON.stringify(数据)+'</pre>');

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。

对于多数组对象字段的排序。在arrprop数组中输入域名,如[“a”,“b”,“c”]然后传入我们要排序的第二个参数arrsource实际源。

function SortArrayobject(arrprop,arrsource){
arrprop.forEach(function(i){
arrsource.sort(function(a,b){
return ((a[i] < b[i]) ? -1 : ((a[i] > b[i]) ? 1 : 0));
});
});
return arrsource;
}