repeatDelay(duration, index) → {Phaser.Tween}
Sets the delay in milliseconds before this tween will repeat itself.The repeatDelay is invoked as soon as you call Tween.start. If the tween is already running this method doesn't do anything for the current active tween.If you have not yet called Tween.to or Tween.from at least once then this method will do nothing, as there are no tweens to set repeatDelay on.If you have child tweens and pass -1 as the index value it sets the repeatDelay across