jQuery实现的回到顶部特效，拖动滚动条时出现一个小火箭，点击小火箭页面动态回至顶部，使用时请引入jquery-1.6.4.min.js插件，暂时不兼容IE,有点遗憾，测试时要使用Chrome或火狐。-Top jQuery to achieve special effects, there is a small rocket when you drag the scroll bar, click on the small rocket back to the top of the page dynamically, please introduced when using jquery-1.6.4.min.js plug, temporarily not compatible with IE, a little disappointed, to use Chrome or Firefox testing.