<images file="animation/background-animation-1.png" filter="nearest">
<area name="background-animation-001" xywh="*"/>
</images>
<images file="animation/background-animation-2.png" filter="nearest">
<area name="background-animation-002" xywh="*"/>
</images>
请问这段代码中的"background-animation-001"和"background-animation-002"是否为首帧与尾帧?