key : string | Phaser.RenderTexture | Phaser.BitmapData | Phaser.Video | PIXI.Texture
The key of the image or texture used by this Game Object during rendering.If it is a string it's the string used to retrieve the texture from the Phaser Image Cache.It can also be an instance of a RenderTexture, BitmapData, Video or PIXI.Texture.If a Game Object is created without a key it is automatically assigned the key __default which is a 32x32 transparent PNG stored within the Cache.If a Game Object is