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弄了一个有两个区域的背景图和一个只有后半区域的背景图，人物原地跑步，打算利用滚屏让大背景的后面区域滚屏到人物背景上时让同步移动的只有后半区域的背景图同步移动到那并滚屏但是我发现同样的速度，滚屏的实际变化速度和移动的实际变化速度是不一样的，大概慢2倍而且不是刚好2倍 这就十分难受了