网页下雪动画背景代码基于snowfall.jquery.js和jquery-1.7.1.min.js制作，有圆角、阴影、圆润阴影、雪集合、Deviceorientation等多种网页下雪特效。-Web-based code snowfall.jquery.js snow animated background and the jquery-1.7.1.min.js production, has rounded corners, shadows, rounded shadows, snow co