Ng模型输入作为数组

Question

我根据我的商品['1','2']重复此输入，然后输入ng-model：

<form id="register-form" form ng-submit="successbloodstock.updateRemark()" >
      <div class="input-group input-group">
         <div class="input-group-addon" style="width:130px">
           <small>EXPIRATION DATE</small>
         </div>
         <input class="form-control"  type="date"  name="expiry_date" 
                ng-model="newExpiry"  required>
      </div>
</form>

但是提交表单后，它不会将ng-model显示为数组：

.controller('successbloodstockCtrl', function($scope,$timeout,$location,$route,$routeParams,$http) {
  var app = this;
  app.number=['asdf','asadf'];
  app.updateRemark = function() {
    var userObject = {}; 
    userObject.expiry_date = $scope.newExpiry;
    console.log($scope.newExpiry[$index])
  }
}

这给了我未定义的