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在固态层上用mask画出箭头的路径轨迹，然后自动生成箭头动画，可以控制箭头的样式，宽度，颜色，动画等属性
Animating arrows in After Effects has never been easier! With Easy Arrows you can attach an arrow to the front and end of a stroke with the click of a button. The arrow(s) will auto-orient along your mask path and change size to match the width of your stroke. There is a default arrow included, but you can also use custom layers of your own!
支持的AE版本？
- AE 2020, CC 2019, CC 2018, CC 2017, CC 2015.3, CC 2015, CC 2014, CC, CS6, CS5.5，Win/Mac，中文版/英文版AE
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)
