public function random()
{
$model = new \App\Model\Post();
$begin = rand($model->min('id'), $model->max('id') - 25);
$posts = $model->where('id', '>', $begin)->paginate(25);
return view('post/list')->with('posts', $posts)->with('type', ['name' => 'random', 'title' => "随机"]);
}