Bezier Curve based easing functions for Javascript animations
此脚本不应直接安装，它是一个供其他脚本使用的外部库。如果您需要使用该库，请在脚本元属性加入：// @require https://update.greasyfork.org/scripts/7108/29098/bezier-easing.js
A fork for greasemonkey script.
Copyright (c) 2014 Gaëtan Renaudeau
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