如何遍历对象数组并累加属性

Question

以下是对象的示例数组：

[{Name : Deji, Age: 12}, {Name : Sonia, Age 13}, {Name : Fabio, Age: 21}]

我如何遍历数组，以增加数组中人员的年龄。

是否有可以增加播放器年龄的功能？

Answer 1

使用Array＃forEach和Array＃reduce遍历数组项并将每个玩家的年龄添加到变量中。

每次

 const players = [{Name : 'Deji', Age: 12}, {Name : 'Sonia', Age: 13}, {Name : 'Fabio', Age: 21}]; let age = 0; players.forEach(player => age += player.Age); console.log(age); 

降低

 const players = [{Name : 'Deji', Age: 12}, {Name : 'Sonia', Age: 13}, {Name : 'Fabio', Age: 21}]; const age = players.reduce((sum, player) => sum + player.Age, 0); console.log(age); 

Answer 2

 var players = [{Name : 'Deji', Age: 12}, {Name : 'Sonia', Age : 13}, {Name : 'Fabio', Age: 21}]; var age = 0; players.forEach(function(el){ age+=el.Age; }) console.log(age) 

使用forEach遍历每个对象，获取元素并访问Age属性，然后添加它。

Answer 3

首先，您的JSON不是有效的JSON，应该是，

[{“ Name”：“ Deji”，“ Age”：12}，{“ Name”：“ Sonia”，“ Age”：13}，{“ Name”：“ Fabio”，“ Age”：21}]

随着angularjs您可以使用JUSE array.reduce函数来计算总。

DEMO

  angular.module('MyModule', []) .controller( 'MyController', function($scope){ $scope.data = [ { "Name": "Deji", "Age": 12 }, { "Name": "Sonia", "Age": 13 }, { "Name": "Fabio", "Age": 21 } ]; $scope.sum = function(items, prop){ return items.reduce( function(a, b){ return a + b[prop]; }, 0); }; $scope.totalAges = $scope.sum($scope.data, 'Age'); }); 

 <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script> <div ng-app='MyModule' ng-controller='MyController'> <p>totalAges = {{totalAges}}</p> </div> 

Answer 4

尝试这个

var a = [{Name : 'Deji', Age: 12}, {Name : 'Sonia', Age : 13}, {Name : 'Fabio', Age: 21}];

var sum = 0;
for(var i of a){

sum += i.Age;

}

console.log(sum);