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

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);

}

这可以通过一个简单的单行值of()排序函数实现。运行下面的代码片段以查看演示。

var家=[{“h_id”:“3”,“城市”:“达拉斯”,“状态”:“TX”,“zip”:“75201”,“价格”:“162500”}, {“h_id”:“4”,“城市”:“贝弗利山”,“状态”:“CA”,“zip”:“90210”,“price”:“319250”}, {“h_id”:“5”,“城市”:“纽约”,“州”:“NY”,“zip”:“00010”,“价格”:“962500”}];console.log(“要首先对降序/最高排序,请使用运算符'<'”);homes.sort(函数(a,b){return a.price.valueOf()<b.price.vvalueOf(;});console.log(homes);console.log(“要首先对升序/最低排序,请使用运算符'>'”);homes.sort(函数(a,b){return a.price.valueOf()>b.price.vvalueOf(;});console.log(homes);

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" }));

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);

有了ECMAScript 6,StoBor的答案可以更加简洁:

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