无法在角度js中设置对象的属性

Question

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

此处键是一个数值。错误是

TypeError: Cannot set property 'digits' of undefined

Answer 1

您需要先为对象设置$scope.objectData[key]的值，然后才能为其添加更多键。

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

Answer 2

首先必须初始化对象$scope.objectData[key]，以便正确的代码为：

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