Laravel -如何从电子邮件模板中访问$notifiable

php artisan make:notification MyNotification

use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Notifications\Messages\MailMessage;
use Illuminate\Notifications\Notification;

class MyNotification extends Notification
{
    use Queueable;

    public function via($notifiable)
    {
        return ['mail'];
    }

    public function toMail($notifiable)
    {
        return (new MailMessage)
            ->subject('Notification Subject')
            ->line('Hello '.$notifiable->name)
            ->line('This is the notification content.');
    }
}

use App\Notifications\MyNotification;

$notifiable = App\User::find(1);
$notifiable->notify(new MyNotification);