Bezier Curve based easing functions for Javascript animations
此腳本不應該直接安裝，它是一個供其他腳本使用的函式庫。欲使用本函式庫，請在腳本 metadata 寫上： // @require https://update.gf.qytechs.cn/scripts/7108/29098/bezier-easing.js
A fork for greasemonkey script.
Copyright (c) 2014 Gaëtan Renaudeau
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