在javascript中按子数组属性值对对象数组进行排序

Posted 2023-02-14

【中文标题】在javascript中按子数组属性值对对象数组进行排序

【英文标题】：Sort array of objects by subarray property value in javascript

【发布时间】：2015-09-02 10:39:53

【问题描述】：

我有一个 javascript 对象数组：

var people = [

    "name": "Edward",
    "age": 100,
    "wallet": 
        "location": "home",
        "cash": 500
    ,
    "bank": 
        "location": "bank street",
        "cash": 22100
    
,

    "name": "Lisa",
    "age": 30,
    "wallet": 
        "location": "home",
        "cash": 20
    ,
    "bank": 
        "location": "bank street",
        "cash": 12340
    
,

    "name": "Elisabeth",
    "age": 50,
    "wallet": 
        "location": "home",
        "cash": 200
    ,
    "bank": 
        "location": "bank street",
        "cash": 5000
    

];

如何按 wallet.cash 对它们进行排序？

如果我想按名称或年龄对这些对象进行排序，以下示例（由 Ege Özcan 编写）可以工作，但我很难修改它以使用多维键。

function dynamicSort(property) 
var sortOrder = 1;
if(property[0] === "-") 
    sortOrder = -1;
    property = property.substr(1);

return function (a,b) 
    var result = (a[property] < b[property]) ? -1 : (a[property] > b[property]) ? 1 : 0;
    return result * sortOrder;

这行得通：

people.sort(dynamicSort("name"));

这不是：

people.sort(dynamicSort("wallet.cash"));

提前谢谢你！

【参考方案1】：

您可以将两个不同的参数传递给 dynamicSort 函数

function dynamicSort(property1,property2) 
var sortOrder = 1;
if(property1[0] === "-") 
    sortOrder = -1;
    property1 = property1.substr(1);

return function (a,b) 
    var result = (a[property1][property2] < b[property1][property2]) ? -1 : (a[property1][property2] > b[property1][property2]) ? 1 : 0;
    return result * sortOrder;

然后调用

dynamicSort("wallet","cash");

演示

var people = [

    "name": "Edward",
    "age": 100,
    "wallet": 
        "location": "home",
        "cash": 500
    ,
    "bank": 
        "location": "bank street",
        "cash": 22100
    
,

    "name": "Lisa",
    "age": 30,
    "wallet": 
        "location": "home",
        "cash": 20
    ,
    "bank": 
        "location": "bank street",
        "cash": 12340
    
,

    "name": "Elisabeth",
    "age": 50,
    "wallet": 
        "location": "home",
        "cash": 200
    ,
    "bank": 
        "location": "bank street",
        "cash": 5000
    

];

    function dynamicSort(property1,property2) 
    var sortOrder = 1;
    if(property1[0] === "-") 
        sortOrder = -1;
        property1 = property1.substr(1);
    
    return function (a,b) 
        var result = (a[property1][property2] < b[property1][property2]) ? -1 : (a[property1][property2] > b[property1][property2]) ? 1 : 0;
        return result * sortOrder;
    
    

alert(JSON.stringify(people.sort(dynamicSort("wallet","cash"))))

【讨论】：

谢谢你！这正是我想要的。然而，第一个代码部分缺少属性 -> property1 更改。

【参考方案2】：

您可以使用this *** answer 中的Object.byString 方法并像这样修改您的代码：

function dynamicSort(property) 
    var sortOrder = 1;
    if(property[0] === "-") 
        sortOrder = -1;
        property = property.substr(1);
    
    return function (a,b) 
        var avalue = Object.byString(a, property);
        var bvalue = Object.byString(b, property);
        var result = (avalue < bvalue) ? -1 : (avalue > bvalue) ? 1 : 0;
        return result * sortOrder;
    

【参考方案3】：

从here提这个比较函数，你可以这样做：

function compare(a,b) 
  if (a.wallet.cash < b.wallet.cash)
    return -1;
  if (a.wallet.cash > b.wallet.cash)
    return 1;
  return 0;


var people = [...];
console.log(people.sort(compare));