视差背景 演示版 包装经理 # NPM npm install parallax_background 安装 包含js < script src =" TweenLite.min.js " > </ script > < script src =" CSSPlugin.min.js " > </ script > < script src =" jquery.min.js " > </ script > < script src =" parallax_background.js " > </ scri