Angular ng-submit 被调用两次

html
<form ng-submit="submitForm()">
  <input type="text" ng-model="name">
  <button type="submit">提交</button>
</form>

Javascript
angular.module('myApp', [])
  .controller('myController', function($scope) {
    $scope.submitForm = function() {
      console.log('表单已提交');
    };
  });

html
<form ng-submit="submitForm($event)">
  <input type="text" ng-model="name">
  <button type="submit">提交</button>
</form>

Javascript
angular.module('myApp', [])
  .controller('myController', function($scope) {
    $scope.submitForm = function(event) {
      event.preventDefault(); // 阻止默认的表单提交行为
      console.log('表单已提交');
    };
  });