Sprite Pointer Events

class Example extends Phaser.Scene
{
    preload ()
    {
        this.load.setBaseURL('https://cdn.phaserfiles.com/v410');
        this.load.spritesheet('aliens', 'assets/sprites/bsquadron-enemies.png', { frameWidth: 192, frameHeight: 160 });
    }

    create ()
    {
        const alien = this.add.sprite(400, 300, 'aliens', 0).setInteractive();

        alien.on('pointerover', function ()
        {

            this.setFrame(3);

        });

        alien.on('pointerout', function ()
        {

            this.setFrame(0);

        });
    }
}

const config = {
    scale: { mode: Phaser.Scale.FIT },
    type: Phaser.AUTO,
    parent: 'game-container',
    width: 800,
    height: 600,
    scene: Example
};

const game = new Phaser.Game(config);