AngularJS - 無法在範圍總結性

Question

我有以下的角碼坐在一個角度控制器：

CODE：

$scope.orangeCrate.italian = { 
    "description": "Annual", 
    "payer": "farmer", 
    "farmerCost": 0, 
    "ownerCost": 21 
}; 

$scope.orangeCrate.portugal = { 
    "description": "Annual", 
    "payer": "owner", 
    "farmerCost": 6.5, 
    "ownerCost": 0 
}; 

$scope.orangeCrate.total = { 
    "farmerCost": $scope.orangeCrate.italian.farmerCost + $scope.orangeCrate.portugal.farmerCost, 
    "ownerCost": $scope.orangeCrate.italian.ownerCost + $scope.orangeCrate.portugal.ownerCost, 
}; 

當我嘗試並打印出裏面的值$scope.orangeCrate.total.farmerCost根據我的觀點，我什麼也沒得到，即使我應該得到6.5！

我在做什麼錯？任何幫助將不勝感激。

謝謝。

Answer 1

像這樣的東西會做（對不起，「窮人」 answer..I'm着急）：

$scope.orangeCrate = { 
    "italian": { 
     "description": "Annual", 
      "payer": "farmer", 
      "farmerCost": 0, 
      "ownerCost": 21 
    }, 
     "portugal": { 
     "description": "Annual", 
      "payer": "owner", 
      "farmerCost": 6.5, 
      "ownerCost": 0 
    } 
}; 
$scope.orangeCrate.total = { 
    "farmerCost": $scope.orangeCrate.italian.farmerCost + $scope.orangeCrate.portugal.farmerCost, 
     "ownerCost": $scope.orangeCrate.italian.ownerCost + $scope.orangeCrate.portugal.ownerCost, 
};