更改控制器中的范围变量不会更改视图中的变量

我将Select2与AngularJS一起使用，我想更改与控制器中的选择框关联的ng模型。目前，在我的plunkr示例中，每当我更新ng模型时，select2框都会清除，就好像我将ng模型重置为空数组一样。如何将其设置为，以便我可以首先添加一个人，然后在控制器中启动一个功能，将更多选择添加到选择框中，然后在框中查看原始选择和新选择？

Plunkr

JS控制器

app.controller('DemoCtrl', function($scope, $http, $timeout) {
  $scope.addSomePeeps = function() {
    var peeps = angular.copy($scope.multipleDemo.selectedPeople)
    $scope.multipleDemo.selectedPeople = peeps.concat([{ name: 'Nicolás',   email: 'nicole@email.com',    age: 43, country: 'Colombia' }]);
  };
  $scope.person = {};
  $scope.people = [
    { name: 'Adam',      email: 'adam@email.com',      age: 12, country: 'United States' },
    { name: 'Amalie',    email: 'amalie@email.com',    age: 12, country: 'Argentina' },
    { name: 'Estefanía', email: 'estefania@email.com', age: 21, country: 'Argentina' },
    { name: 'Adrian',    email: 'adrian@email.com',    age: 21, country: 'Ecuador' },
    { name: 'Wladimir',  email: 'wladimir@email.com',  age: 30, country: 'Ecuador' },
    { name: 'Samantha',  email: 'samantha@email.com',  age: 30, country: 'United States' },
    { name: 'Nicole',    email: 'nicole@email.com',    age: 43, country: 'Colombia' },
    { name: 'Natasha',   email: 'natasha@email.com',   age: 54, country: 'Ecuador' },
    { name: 'Michael',   email: 'michael@email.com',   age: 15, country: 'Colombia' },
    { name: 'Nicolás',   email: 'nicolas@email.com',    age: 43, country: 'Colombia' }
  ];
  $scope.multipleDemo = {};
  $scope.multipleDemo.selectedPeople = [$scope.people[5], $scope.people[4]];
});

HTML

<body ng-controller="DemoCtrl">
  <h3>Array of objects</h3>
  <ui-select multiple ng-model="multipleDemo.selectedPeople" theme="select2" ng-disabled="disabled" style="width: 800px;">
    <ui-select-match placeholder="Select person...">{{$item.name}} &lt;{{$item.email}}&gt;</ui-select-match>
    <ui-select-choices repeat="person in people | propsFilter: {name: $select.search, age: $select.search}">
      <div ng-bind-html="person.name | highlight: $select.search"></div>
      <small>
        email: {{person.email}}
        age: <span ng-bind-html="''+person.age | highlight: $select.search"></span>
      </small>
    </ui-select-choices>
  </ui-select>
  <p>Selected: {{multipleDemo.selectedPeople}}</p>
  <button ng-click="addSomePeeps()">Click me to add some specific peeps</button>
</body>

$scope.$watch('multipleDemo',function(newValue,oldValue){
                console.log("WATCH IN PROGRESS: "+newValue+" "+ oldValue);
            });

这种固定的地雷。我认为watch函数调用了$scope$应用绑定新值。我试过使用$scope$应用程序，它工作，但抛出了一个错误。

希望对有所帮助

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