Javascript 无法在angular js中的对象中设置属性

这里的键是一个数值。错误是

$scope.objectData = {};
$scope.objectData[key]["digits"] =  set.first+','+set.second+','+set.third+','+set.fourth;

---

您需要为对象设置

$scope.objectData[key]

的值，然后才能向其添加更多键

TypeError: Cannot set property 'digits' of undefined

---

首先必须初始化对象

$scope.objectData[key]

，这样正确的代码应该是：

$scope.objectData[key] = {};
$scope.objectData[key]['digits'] = 'foo';

$scope.objectData = {};
$scope.objectData[key] = {};
$scope.objectData[key]["digits"] = set.first+','+set.second+','+set.third+','+set.fourth;