Angularjs ng-selected 高端用法，针对json list

$scope.updateForm = {id: 33, code: "subwayLine2", name: "川沙"}


<select class="form-control" ng-model="updateForm.code">
  <option value="">--请选择--</option>
  <option ng-repeat="v in codeList" ng-selected="updateForm.code == v.code">{{v.code}}</option>
</select>