/**
  * 添加文章
  */
 public function add()
 {
     $this->checkLogin();
     $Department = new DepartmentModel();
     $departments = $Department->getAllDepartments();
     $category = new CategoryModel();
     $categories = $category->getCategories();
     $this->assign('categories', $categories);
     $this->assign('departments', $departments);
     $this->display();
 }