var button;
function preload()
{
this.load.spritesheet( 'btn' , 'assets/playgame.png' ,{frameWidth:256,frameHeight:64});
}
function create ()
{
button=this.add.sprite(400,300,'btn').setInteractive();
button.on('pointerover',function(pointer){
button.setFrame(1);
})
button.on('pointerout',function(pointer){
button.setFrame(0);
})
}