add當用戶單擊按鈕時，我試圖創建一個新的矩形。這個矩形也將有一個輸入字段并為這些字段選擇我試圖ng-model動態分配并讀取控制器中的相應值。HTML:<button id="AddNewField" ng-click="AddNewField();" class="btn btn-success"> Add New </button><div ng-repeat="(key,value) in NewFieldValues">    {{ value.ID }}    <div style="width:250px;height:100px;border:1px solid #000;" draggable="true">        <select ng-model="BusinessStep[value.ID]" ng-change="BusinessStepChange(value.ID)" class="form-control">            <option ng-repeat="businessStep in businessSteps" value="{{ businessStep.value }}"> {{ businessStep.text }} </option>        </select>        <br/>        <input type="text" ng-model="Events[value.ID]"></input>    </div></div>Angularjs: $scope.NewFieldValues = [];$scope.FieldID          =   0;$scope.AddNewField  =   function(){    item            =   {};    item["ID"]      =   $scope.FieldID;    item["Fields"]  =   [];    $scope.NewFieldValues.push(item);    $scope.FieldID++;}$scope.BusinessStepChange   =   function(BusinessStepID){        for(var bs=0; bs<$scope.NewFieldValues.length; bs++)    {        if($scope.NewFieldValues[bs].ID ==  BusinessStepID)        {            console.log($scope.NewFieldValues[bs]);            console.log($scope.BusinessStep);            $scope.NewFieldValues[bs]['Fields'].BusinessStep    =   "Hello"; //Read the value from corresponding select field        }    }       }如何ng-model為矩形中的每個字段動態分配字段，以及如何在控制器函數中讀取它們