Curves意思是曲线控制，对动画播放速度的控制，我的理解是加速度的变化
1.linear 匀速，线性
linear
2.decelerate f(t) = √2
decelerate
3.ease
ease
4.easeIn
easeIn
5.easeInToLinear
easeInToLinear
6.easeInSine
easeInSine
7.easeInQuad
easeInQuad
8.easeInCubic
easeInCubic
9.easeInQuart
easeInQuart
11.easeInQuint
12.easeInExpo
easeInExpo
13.easeInCirc
easeInCirc
14.easeInBack
15.easeOut
easeOutSine
easeOutQuad
easeOutCubic
easeOutQuart
easeOutQuint
easeOutExpo
easeOutCirc
easeOutBack
easeInOut
easeInOutSine
easeInOutQuad
easeInOutCubic
easeInOutQuart
easeInOutQuint
easeInOutExpo
easeInOutCirc
easeInOutBack
fastOutSlowIn
slowMiddle
bounceIn
bounceOut
bounceInOut
elasticIn
elasticOut
elasticInOut
