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可以给图层的同一个属性添加不同的表达式，然后控制不同时段使用不同的表达式，表达式之前动画也可以顺滑过渡
The ExpressionTimeline allows you to apply several expressions to a property, so that each expression is ony active for a certain period of time. Instead of an abrupt change between expressions, you can smoothly transition from one expression to the next. What’s more, you can specify time intervals in which no expression is active, so that the keyframed motion is considered.
支持的AE版本？
- AE 2022, 2021, 2020, CC 2019, CC 2018, CC 2017, CC 2015.3, CC 2015, CC 2014, CC, CS6, CS5.5, CS5, CS4, CS3, Win/Mac
AE脚本怎么安装？
- 拷贝jsxbin文件到Support Files\Scripts\ScriptUI Panels
AE脚本不能用？
- 不要用中文版AE，中文版表达式会报错
- 偏好设置,Edit—Preferences—General面板下,勾选上Allow Scripts to Write Files and Access Network
- 脚本不支持你的AE版本(可能性较小)
脚本点击下载
使用教程点击下载
