/**
  * Store a newly created resource in storage.
  *
  * @return Response
  */
 public function store(NavigationForm $request)
 {
     try {
         if (Navigation::create($request->all())) {
             Notification::success('添加成功');
             return redirect()->route('backend.nav.index');
         }
     } catch (\Exception $e) {
         return redirect()->back()->withErrors(array('error' => $e->getMessage()))->withInput();
     }
 }