laravel访问不存在的路由跳转到自定义的错误页面

//找到app/Exceptions/Handler.php打开，添加下面代码，记得先use一下

1. use Symfony\Component\HttpKernel\Exception\MethodNotAllowedHttpException;
2. use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;

public function render($request, Exception $exception)
{

// 如果 不被允许的路由 或者不存在
if ($exception instanceof MethodNotAllowedHttpException || $exception instanceof NotFoundHttpException) {
if (!($request->ajax() || $request->wantsJson())) {
return response()->view('error.404');
}
}
return parent::render($request, $exception);
}