1、新建html文档。
3、书写css代码。<style>*{ margin:0; padding:0;}body{b锾攒揉敫ackground-color: #F1F1F1;color: #333}.dn{display: none;}.go-top{position: fixed;bottom: 40px;right: 20px;width: 46px;z-index: 999;}.go-top a{display: block;width: 46px;height: 46px;margin-bottom: 10px;background-image: url(o-top.png?);}.go-top a:last-child{margin-bottom: 0;}.go-top .go{background-position: 0 -150px;}.go-top .go:hover{background-position: 0 -250px;}.go-top .feedback{background-position: 0 -100px;}.go-top .feedback:hover{background-position: 0 -300px;}.go-top .uc-2vm{background-position: 0 0;}.go-top .uc-2vm:hover{background-position: 0 -350px;}.go-top .uc-2vm-pop{position: absolute;right: 60px;top: -100px; width: 220px;box-shadow: 0px 1px 4px rgba(0,0,0,.1);background: #fff;}.go-top .uc-2vm-pop .title-2wm{font-size: 14px; margin: 10px 20px;}.go-top .uc-2vm-pop .logo-2wm-box{position: relative;}</style>
5、代码整体结构。
