所有Tween动画曲线类型

EaseInSine = 1,EaseOutSine = 2,EaseInOutSine = 3,

EaseInQuad = 4,EaseOutQuad = 5,EaseInOutQuad = 6,

EaseInCubic = 7,EaseOutCubic = 8,EaseInOutCubic = 9,

EaseInQuart = 10,EaseOutQuart = 11,EaseInOutQuart = 12,

EaseInQuint = 13,EaseOutQuint = 14,EaseInOutQuint = 15,

EaseInExpo = 16,EaseOutExpo = 17,EaseInOutExpo = 18,

EaseInCirc = 19,EaseOutCirc = 20,EaseInOutCirc = 21,

EaseInElastic = 22,EaseOutElastic = 23,EaseInOutElastic = 24,

EaseInBack = 25,EaseOutBack = 26,EaseInOutBack = 27,

EaseInBounce = 28,EaseOutBounce = 29,EaseInOutBounce = 30,

AnimationCurve = 31

EaseType 效果

http://www.robertpenner.com/easing/easing_demo.html