在尝试混合动画中的不同类型的值之前，我遇到了问题.您可以尝试获取窗口高度并将其转换为ems，以查看它是否更喜欢em-em动画而不是em-per-percent.它可能为您解决，也可能无法解决，但这是我的想法.

I've had problems before with trying to mix different types of values in animate. You might try getting the window height and converting it to ems to see if it likes an em-to-em animation better than em-to-percent. It may or may not fix it for you, but that's my thought.