删除angularjs中的重复数组项

<div ng-app="myApp" ng-controller="myCtrl">
  <ul>
    <li ng-repeat="item in items | unique">{{ item }}</li>
  </ul>
</div>

<script>
  var app = angular.module('myApp', []);
  app.controller('myCtrl', function($scope) {
    $scope.items = [1, 2, 3, 3, 4, 5, 5];
  });
  app.filter('unique', function() {
    return function(collection) {
      return collection.filter(function(item, index, self) {
        return self.indexOf(item) === index;
      });
    };
  });
</script>

<div ng-app="myApp" ng-controller="myCtrl">
  <ul>
    <li ng-repeat="item in uniqueItems">{{ item }}</li>
  </ul>
</div>

<script>
  var app = angular.module('myApp', []);
  app.controller('myCtrl', function($scope) {
    $scope.items = [1, 2, 3, 3, 4, 5, 5];
    $scope.uniqueItems = Array.from(new Set($scope.items));
  });
</script>