laravel_study/app/Listeners/DemoListener.php

<?php

namespace App\Listeners;

use App\Events\Event;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Contracts\Queue\ShouldQueue;
use App\Events\DemoEvent;

class DemoListener
{
    /**
     * Create the event listener.
     *
     * @return void
     */
    public function __construct(DemoEvent $event)
    {

        //
    }

    /**
     * Handle the event.
     *
     * @param  Event  $event
     * @return void
     */
    public function handle(DemoEvent $event)
    {
        $demo=$event->demo;
//        dd($demo);
        $demo->number=$demo->number+1;
        $demo->save;
        //
    }
}