How to move a sprite on a map ?

[serban123]

I am learning Phaser 3 and I am trying to move a sprite but it doesnt move. This is the code:

 

var config = {
    type: Phaser.AUTO,
    width: 450,
    height: 450,
    
    scene: {
        preload: preload,
        create: create,
        update: update
    }
};

var game = new Phaser.Game(config);
var cursors;

function preload() {
    this.load.image('sky','back.jpg');
    this.load.image('logo','logo.png')
    
}



function create() {
    this.add.image(0,0,'sky').setOrigin(0);
    player = this.add.sprite(200,200,'logo');
    player.setCollideWorldBounds(true);

    cursors = this.input.keyboard.createCursorKeys();

    
    
    
    
    
    
}

function update() {
   
    if (this.input.keyboard.isDown(Phaser.Keyboard.LEFT))
    {
        player.x -= 4;
    }
    else if (this.input.keyboard.isDown(Phaser.Keyboard.RIGHT))
    {
        player.x += 4;
    }

    if (this.input.keyboard.isDown(Phaser.Keyboard.UP))
    {
        player.y -= 4;
    }
    else if (this.input.keyboard.isDown(Phaser.Keyboard.DOWN))
    {
        player.y += 4;
    }
    
}

Thank you in advance