如何在laravel中实现通知

<?php

namespace App\Notifications;

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

class ExampleNotification extends Notification
{
    use Queueable;

    public function __construct()
    {
        //
    }

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

    public function toMail($notifiable)
    {
        return (new MailMessage)
            ->subject('Example Notification')
            ->line('This is an example notification.')
            ->action('View', url('/'))
            ->line('Thank you for using our application!');
    }

    public function toDatabase($notifiable)
    {
        return [
            'message' => 'This is an example notification.',
            'url' => url('/'),
        ];
    }
}

use App\Notifications\ExampleNotification;
use Illuminate\Support\Facades\Notification;

Notification::send($user, new ExampleNotification);