Javascript Angularjs:ng选择列表的更改

我使用的是angularjs，我有一个指示，显示问题列表。当

selectedQuestion

更改时，我打算执行一些逻辑。因此，我使用了

ng change

这是我的指示：

 restrict: 'EA',
            scope: {                             
                selectedQuestion: '=?', 
                questionsList: '='  
            },
            link: function (scope) {
                scope.change = function () {
                    if (scope.selectedQuestion) {
                        //do something
                    }
                };
            }

   <select  ng-model="selectedQuestion"
            ng-options="avail.question for avail in questionsList track by avail.id" ng-change="change()"
   </select>

  {{selectedQuestion}}

link: function (scope) {
        scope.change = function (currentQuestion) {
            if (currentQuestion) {
            }
        };
     }

这是my指令的html模板：

 restrict: 'EA',
            scope: {                             
                selectedQuestion: '=?', 
                questionsList: '='  
            },
            link: function (scope) {
                scope.change = function () {
                    if (scope.selectedQuestion) {
                        //do something
                    }
                };
            }

   <select  ng-model="selectedQuestion"
            ng-options="avail.question for avail in questionsList track by avail.id" ng-change="change()"
   </select>

  {{selectedQuestion}}

link: function (scope) {
        scope.change = function (currentQuestion) {
            if (currentQuestion) {
            }
        };
     }

---

尝试将模型作为参数传递给
ng change
函数：

<select ng-model="selectedQuestion"
        ng-options="avail.question for avail in questionsList track by avail.id" 
        ng-change="change(selectedQuestion)"
</select>

尝试将模型作为参数传递给
ng change
函数：

<select ng-model="selectedQuestion"
        ng-options="avail.question for avail in questionsList track by avail.id" 
        ng-change="change(selectedQuestion)"
</select>