javascript - 遍历 Javascript 对象并计数

Question

我有这个 javascript 对象。如何遍历其属性并计算一个特定值的数量？

    angular.module('App',[])
        .controller('mainCtrl', ['$scope', function ($scope) {

           var data = {  
   "plans":[  
      {  
         "id":1,
         "code":"NEXT_DAY_500gm",
         "name":"Next Day less than 500gm",
         "cost":55,
         "duration":24,
         "min_weight":0,
         "max_weight":500,
         "COD":1,
         "created_at":"-0001-11-30 00:00:00",
         "updated_at":"-0001-11-30 00:00:00"
      },
      {  
         "id":2,
         "code":"NEXT_DAY_500gm_1kg",
         "name":"Next Day 500gm to 1kg",
         "cost":70,
         "duration":24,
         "min_weight":501,
         "max_weight":1000,
         "COD":1,
         "created_at":"-0001-11-30 00:00:00",
         "updated_at":"-0001-11-30 00:00:00"
      },
      {  
         "id":3,
         "code":"NEXT_DAY_1kg_2kg",
         "name":"Next Day 1kg to 2kg",
         "cost":95,
         "duration":24,
         "min_weight":1001,
         "max_weight":2000,
         "COD":1,
         "created_at":"-0001-11-30 00:00:00",
         "updated_at":"-0001-11-30 00:00:00"
      },
      {  
         "id":4,
         "code":"SAME_DAY_500gm",
         "name":"Same Day less than 500gm",
         "cost":95,
         "duration":8,
         "min_weight":0,
         "max_weight":500,
         "COD":1,
         "created_at":"-0001-11-30 00:00:00",
         "updated_at":"-0001-11-30 00:00:00"
      },
      {  
         "id":5,
         "code":"SAME_DAY_500gm_1kg",
         "name":"Same Day 500gm to 1kg",
         "cost":130,
         "duration":8,
         "min_weight":501,
         "max_weight":1000,
         "COD":1,
         "created_at":"-0001-11-30 00:00:00",
         "updated_at":"-0001-11-30 00:00:00"
      },
      {  
         "id":6,
         "code":"SAME_DAY_1kg_2kg",
         "name":"Same Day 1kg to 2kg",
         "cost":165,
         "duration":8,
         "min_weight":1001,
         "max_weight":2000,
         "COD":1,
         "created_at":"-0001-11-30 00:00:00",
         "updated_at":"-0001-11-30 00:00:00"
      }
   ]
};  
          $scope.data1=data;       
       }]);

我的想法是我想计算“状态”字段为“完成”的次数并将该计数分配给一个变量。说如果完成是 4 倍我的销售额将等于 4。我该怎么做？有什么提示吗？

Answer 1

这里需要使用过滤器:

var count = data.filter(function(obj) {
    return obj.status === 'COMPLETED';
}).length;

console.log(count);