Laravel 5活动不发送活动

Question

I try get event in laravel. 1)Call Event:

  broadcast(new MessagePosted($message, $user))->toOthers();

2) MessagePosted:

  public function __construct(Message3 $message, User $user)
    {
        $this->message=$message;
        $this->user=$user;
    }

    /**
     * Get the channels the event should broadcast on.
     *
     * @return \Illuminate\Broadcasting\Channel|array
     */
    public function broadcastOn()
    {
        return new Channel('chatroom');
    }

Fix .env:

BROADCAST_DRIVER=pusher
PUSHER_APP_ID=from https://dashboard.pusher.com/
PUSHER_APP_KEY= from https://dashboard.pusher.com/
PUSHER_APP_SECRET= from https://dashboard.pusher.com/
PUSHER_CLUSTER=en 

Add in bootstrap.js:

import Echo from 'laravel-echo'

window.Pusher = require('pusher-js');

window.Echo = new Echo({
    broadcaster: 'pusher',
    key: process.env.MIX_PUSHER_APP_KEY,
    cluster: process.env.MIX_PUSHER_APP_CLUSTER,
    encrypted: true
});

Listener on blade:

  mounted() {
                this.echo.join('chatroom')
                    .here()
                    .joining()
                    .leaving()
                    .listen('MessagePosted', (e) => {
                        console.log(e);
                        console.log("messages get!")
                    });
            },

For some reason, the event does not work. In file MessagePosted all work (check in dump).