/**
  * 查找首页布局的元素
  * @param $id
  * @return ShopIndexLayout
  * @throws DeepInException
  */
 protected function find($id)
 {
     $layout = ShopIndexLayout::find($id);
     if ($layout instanceof ShopIndexLayout) {
         return $layout;
     }
     throw new DeepInException("找不到对应的布局~!");
 }