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

我最近编写了一个通用函数,如果您想使用它,可以为您管理它。

/**
 * Sorts an object into an order
 *
 * @require jQuery
 *
 * @param object Our JSON object to sort
 * @param type Only alphabetical at the moment
 * @param identifier The array or object key to sort by
 * @param order Ascending or Descending
 *
 * @returns Array
 */
function sortItems(object, type, identifier, order){

    var returnedArray = [];
    var emptiesArray = []; // An array for all of our empty cans

    // Convert the given object to an array
    $.each(object, function(key, object){

        // Store all of our empty cans in their own array
        // Store all other objects in our returned array
        object[identifier] == null ? emptiesArray.push(object) : returnedArray.push(object);

    });

    // Sort the array based on the type given
    switch(type){

        case 'alphabetical':

            returnedArray.sort(function(a, b){

                return(a[identifier] == b[identifier]) ? 0 : (

                    // Sort ascending or descending based on order given
                    order == 'asc' ? a[identifier] > b[identifier] : a[identifier] < b[identifier]

                ) ? 1 : -1;

            });

            break;

        default:

    }

    // Return our sorted array along with the empties at the bottom depending on sort order
    return order == 'asc' ? returnedArray.concat(emptiesArray) : emptiesArray.concat(returnedArray);

}

其他回答

Array.prototype.sortBy = function(callback) {
  return this.sort((a, b) => callback(a) - callback(b))
}

[1,2,3,2].sortBy(i => i) // [1, 2, 2, 3]
[1,2,3,2].sortBy(i => i == 2) // [1, 3, 2, 2]

这里是以上所有答案的顶点。

Fiddle验证:http://jsfiddle.net/bobberino/4qqk3/

var sortOn = function (arr, prop, reverse, numeric) {

    // Ensure there's a property
    if (!prop || !arr) {
        return arr
    }

    // Set up sort function
    var sort_by = function (field, rev, primer) {

        // Return the required a,b function
        return function (a, b) {

            // Reset a, b to the field
            a = primer(a[field]), b = primer(b[field]);

            // Do actual sorting, reverse as needed
            return ((a < b) ? -1 : ((a > b) ? 1 : 0)) * (rev ? -1 : 1);
        }

    }

    // Distinguish between numeric and string to prevent 100's from coming before smaller
    // e.g.
    // 1
    // 20
    // 3
    // 4000
    // 50

    if (numeric) {

        // Do sort "in place" with sort_by function
        arr.sort(sort_by(prop, reverse, function (a) {

            // - Force value to a string.
            // - Replace any non numeric characters.
            // - Parse as float to allow 0.02 values.
            return parseFloat(String(a).replace(/[^0-9.-]+/g, ''));

        }));
    } else {

        // Do sort "in place" with sort_by function
        arr.sort(sort_by(prop, reverse, function (a) {

            // - Force value to string.
            return String(a).toUpperCase();

        }));
    }


}

嗨,看完这篇文章后,我根据自己的需要制作了一个sortComprator,它具有比较多个json属性的功能,我想和大家分享一下。

此解决方案仅按升序比较字符串,但该解决方案可以方便地扩展到每个属性以支持:反向排序、其他数据类型、使用区域设置、强制转换等

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"

}];

// comp = array of attributes to sort
// comp = ['attr1', 'attr2', 'attr3', ...]
function sortComparator(a, b, comp) {
    // Compare the values of the first attribute
    if (a[comp[0]] === b[comp[0]]) {
        // if EQ proceed with the next attributes
        if (comp.length > 1) {
            return sortComparator(a, b, comp.slice(1));
        } else {
            // if no more attributes then return EQ
            return 0;
        }
    } else {
        // return less or great
        return (a[comp[0]] < b[comp[0]] ? -1 : 1)
    }
}

// Sort array homes
homes.sort(function(a, b) {
    return sortComparator(a, b, ['state', 'city', 'zip']);
});

// display the array
homes.forEach(function(home) {
    console.log(home.h_id, home.city, home.state, home.zip, home.price);
});

结果是

$ node sort
4 Bevery Hills CA 90210 319250
5 New York NY 00010 962500
3 Dallas TX 75201 162500

还有另一种

homes.sort(function(a, b) {
    return sortComparator(a, b, ['city', 'zip']);
});

带有结果

$ node sort
4 Bevery Hills CA 90210 319250
3 Dallas TX 75201 162500
5 New York NY 00010 962500

如果使用Undercore.js,请尝试sortBy:

// price is of an integer type
_.sortBy(homes, "price"); 

// price is of a string type
_.sortBy(homes, function(home) {return parseInt(home.price);}); 

这是一个更灵活的版本,允许您创建可重用的排序函数,并按任何字段排序。

const sort_by=(字段,反转,引物)=>{常量键=引物?函数(x){返回底漆(x[字段])} :函数(x){返回x[字段]};反转=!颠倒1 : -1;返回函数(a,b){返回a=键(a),b=键(b),反转*((a>b)-(b>a));}}//现在您可以随意按任何字段排序。。。const homes=[{h_id:“3”,城市:“达拉斯”,州:“TX”,邮编:“75201”,价格:“162500”},{h_id:“4”,城市“贝弗利山”,州“CA”,邮编“90210”,价格“319250”},{h_id:”5“,城市:”纽约“,州:”NY“,邮编:”00010“,价格:”962500“}];//按价格从高到低排序console.log(homes.sort(sort_by('price',true,parseInt)));//按城市排序,不区分大小写,A-Zconsole.log(homes.sort(sort_by('city',false,(a)=>a.toUpperCase())));