AE箭头路径运动脚本 Path Arrow + 使用教程可以在AE中沿路径制作箭头动画，调节箭头的大小，描边，运动速率等多种参数，支持CS6或者更高版本AE，其他的脚本例如Easy Arrows也可以制作类型的效果The After Effects Path Arrow Preset works with Text Animators, and a path.

It will build you an arrow that you can easily animate around as you would any other text animator in AE.