On Down Event

var config = {
    type: Phaser.WEBGL,
    parent: 'phaser-example',
    width: 800,
    height: 600,
    scene: {
        preload: preload,
        create: create
    }
};

var game = new Phaser.Game(config);

function preload ()
{
        this.load.setBaseURL('https://cdn.phaserfiles.com/v355');
    this.load.image('pic', 'assets/pics/nayuki.png');
}

function create ()
{
    var sprite = this.add.sprite(400, 300, 'pic').setInteractive();

    var text = this.add.text(10, 10, 'Tap the Sprite', { font: '16px Courier', fill: '#00ff00' });

    var text2 = this.add.text(10, 100, Phaser.VERSION + ' + v2', { font: '16px Courier', fill: '#ffffff' });

    sprite.on('pointerdown', function () {

        this.setTint(Math.random() * 16000000);

        text.setText('DOWN');

    });

    sprite.on('pointerup', function () {

        text.setText('UP');

    });
}