如何在AngularJS中手动触发表单的提交？

<form ng-app="myApp" ng-controller="myCtrl" ng-submit="submitForm()">
 <input type="text" ng-model="username" required>
 <button type="submit">Submit</button>
</form>

angular.module('myApp', [])
  .controller('myCtrl', ['$scope', function($scope) {
    $scope.submitForm = function() {
      // 处理表单提交的逻辑
      console.log('Form submitted:', $scope.username);
    };
  }]);

<form ng-app="myApp" ng-controller="myCtrl" name="myForm">
 <input type="text" ng-model="username" required>
 <button ng-click="submitForm()">Submit</button>
</form>

angular.module('myApp', [])
  .controller('myCtrl', ['$scope', function($scope) {
    $scope.submitForm = function() {
      $scope.myForm.$setSubmitted(true);
      if ($scope.myForm.$valid) {
        // 处理表单提交的逻辑
        console.log('Form submitted:', $scope.username);
      }
    };
  }]);

<form ng-app="myApp" ng-controller="myCtrl" name="myForm">
 <input type="text" ng-model="username" required>
 <button ng-click="submitForm()">Submit</button>
</form>

angular.module('myApp', [])
  .controller('myCtrl', ['$scope', function($scope) {
    $scope.submitForm = function() {
      $scope.myForm.$setSubmitted(true);
      if ($scope.myForm.$valid) {
        // 处理表单提交的逻辑
        console.log('Form submitted:', $scope.username);
      }
    };
  }]);