以下是基于您的代码的示例.

angular.module('directives')
.directive('myDirective',['$q',function($q) {
   return {
     scope: {
       onEvent: '&'
     }
     // ...
     link: function($scope,$element) {
       $scope.handleEvent() {
         $q.when($scope.onEvent()) {
           ...
         }
       }
     }
  }
}])