Bezier Curve based easing functions for Javascript animations
此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @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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