在第二次提交表单时神秘地未设置请求有效负载：AngularJS

Question

迫切需要另一双眼睛。此表单提交在第一次提交时完美运行。但除非我再次重新加载页面，否则它将失败。我觉得我已经检查了所有内容，无论js中的内容如何，​​表单值都会重置，但由于某种原因，它们不会在第二篇文章中将其置于Request负载中。非常感谢任何帮助。

$scope.submitLogin = function(data) {
  var form = $scope.login;
  $scope.formerror = '';
  $scope.success = '';
  if (form.username.length > 0 &&
    form.password.length > 0) {
    console.log(form.username);
    console.log(form.password);
    $http.post('/login', form)
      .success(function(data) {
        $scope.success = data['res'];
        $scope.login = [];
        window.scrollTo(0, 0);
      })
      .error(function(data) {
        $scope.formerror = data;
      });

  } else {
    $scope.formerror = "something went wrong. Try again.";
  }
  //$scope.form = new Array({'error':'test', 'msg':''});
}

<form id="login-form" ng-submit="submitLogin()" role="form">

  <label for="login_user">username: </label>
  <input id="login_user" ng-model="login.username" type="text" name="username" class="form-control" placeholder="username">


  <label for="login_password">password: </label>
  <input id="login_password" ng-model="login.password" type="password" name="password" class="form-control" placeholder="password">

  <input class="btn btn-primary" type="submit" class="btn btn-success btn-send" value="login">

</form>