在CodeIgniter控制器中用Sweet Alert替换警报

Question

我很困，因为我仍然不知道如何从下面的代码中应用Sweetalert。

登录视图：

                            <form id="formlogin" action="<?=site_url('auth/process')?>" method="post">
                              <div class="form-group has-feedback">
                                <input type="text" id="name" name="username" class="form-control" placeholder="Username" autofocus required>
                                <span class="glyphicon glyphicon-user form-control-feedback"></span>
                              </div>
                              <div class="form-group has-feedback">
                                <input type="password" id="password" name="password" class="form-control" placeholder="Password" required>
                                <span class="glyphicon glyphicon-lock form-control-feedback"></span>
                              </div>
                              <div class="row">
                                <div class="col-xs-8">
                                <a style="vertical-align:middle; line-height:40px" href="<?=site_url('account')?>" class="text-center">Register a new account</a>
                                </div>
                                <div class="col-xs-4">
                                  <button type="submit" name="login" class="btn btn-primary btn-block btn-flat">Sign In</button>
                                </div>
                              </div>
                            </form>

登录过程控制器：

                                public function process()
                                {
                                    $post = $this->input->post(null, TRUE);
                                    //print_r ($post);
                                    if( isset ( $post['login'] ) ) {
                                        $this->load->model('user_m');
                                        $query = $this->user_m->login($post);
                                        if ($query->num_rows() > 0) {
                                            //echo "Login process success";
                                            $row = $query->row();
                                            // echo $row->username;
                                            $params = array(
                                                'userid' => $row->id_user,
                                                'level' => $row->level,
                                            );
                                            $this->session->set_userdata($params);                
                                            echo "<script>
                                            alert ('Login Success');
                                            </script>";
                                        } else {
                                            echo "<script>
                                            alert ('Login Fail');              
                                            </script>";
                                        }
                                    }
                                }

在Codeigniter中用户成功登录后，如何更改以使用Sweetalert而不是正常警报？