angularjs ng-options嵌套变量

Question

Ng-options似乎不适用于$scope上的object。对于ex。$scope.model.colors。是我的代码中的错误还是错误。http://jsfiddle.net/wbsrvc/uDteZ/#base

function Main($scope) {
 $scope.model.selected = "value1";
 $scope.model.colors = ["value1", "value2", "value3"];
}
<div ng-controller="Main" ng-app> <span>{{selected}}</span>

  <input ng-model="model.selected" />
  <select ng-model="model.selected" ng-options="v for v in model.colors"></select>
</div>

Answer 1

缺少在作用域中创建模型对象

function Main($scope) {

 $scope.model = {};  //create model object in scope.
 $scope.model.selected = "value1";
 $scope.model.colors = ["value1", "value2", "value3"];
}

Answer 2

告诉$scope.model它是一个对象

function Main($scope) {
  $scope.model = {};
  $scope.model.selected = "value1";
  $scope.model.colors = ["value1", "value2", "value3"];
}

Angular在没有定义的情况下无法找到模型