Play an animation with the given key, starting at the given startFrame on all Game Objects in items.
|items||array | Array.<Phaser.GameObjects.GameObject>||
An array of Game Objects. The contents of this array are updated by this Action.
The name of the animation to play.
|startFrame||string | number||<optional>||
The starting frame of the animation with the given key.
The array of Game Objects that was passed to this Action.