如何使用AngularJs过滤两个字段的相同select？

<select ng-model="field1" ng-options="item for item in field1Options"></select>
<select ng-model="field2" ng-options="item for item in field2Options"></select>

$scope.field1Options = ['Option 1', 'Option 2', 'Option 3'];
$scope.field2Options = ['Option 1', 'Option 2', 'Option 3'];

$scope.filterOptions = function() {
  // 过滤两个字段的相同选项
  $scope.filteredOptions = $scope.field1Options.filter(function(option) {
    return $scope.field2Options.indexOf(option) !== -1;
  });
};

<select ng-model="filteredOption" ng-options="item for item in filteredOptions"></select>

$scope.filterOptions();