CSS3学习笔记（4）-上下滑动展开的按钮_html/css_WEB-ITnose
好吧，我最近没有什么进步，其实吧，我在偷懒耶，这几天太冷落代码了，都在做设计，晕乎乎的，
下面来看看我以前写的一个上下滑动展开的按钮效果：
这类的效果经常会在一些网站页面下载按钮处看到，当你鼠标悬浮在下载按钮时，会提醒你是否已注册，或者点击登录什么的小提示~~~~~
一、页面的主体布局
<!DOCTYPE html><html> <head> <meta charset="utf-8" /> <title></title> <link type="text/css" rel="stylesheet" href="css/both_slid_menu.css" /> </head> <body> <div class="both_sild_menu"> <div class="sild_top">我是上面</div> <a href="#" target="_blank">鼠标放在我上面试试</a> <div class="sild_bottom">我是下面</div> </div> </body></html>
布局就不多说了，很简单~~~~~
二、CSS样式（主要是CSS3）
先说一下动画的原理：
（1）先来布局，我是将三个DIV并列排出来，如下图：
（2）把sild_top和sild_bottom的两个子级按钮置于a标签按钮的下方，用定位里面的z-index属性
（3）然后sild_top和sild_bottom的两个子级按钮进行位移到a标签按钮正下方
（4）为sild_top和sild_bottom的两个子级按钮设置动画
.both_sild_menu{ text-align: center; width: 300px;}.both_sild_menu .sild_top{ text-decoration: none; padding: 10px; background-color: #6c987e; border-radius: 10px 10px 0 0; /*让它的位置在名为both_sild_menu a的底部，且隐藏起来*/ transform: translate(0,40px); opacity: 0; /*置于底部后再让它透明度为0，不显示*/ position: relative; z-index: 1;}.both_sild_menu a{ display: block; text-decoration: none; padding: 10px; background-color: #7eedaa; position: relative; z-index: 2; /*让它的位置在顶部*/}.both_sild_menu .sild_bottom{ text-decoration: none; padding: 10px; background-color: #6c987e; border-radius: 0 0 10px 10px; /*让它的位置在名为both_sild_menu a的底部，且隐藏起来*/ opacity: 0; transform: translate(0,-40px); position: relative; z-index: 1; }.both_sild_menu .sild_top,.both_sild_menu .sild_bottom{ /*给两个DIV设置动画的属性*/ transition: all 0.2s ease-in-out 0s; -moz-transition: all 0.2s ease-in-out 0s; -ms-transition: all 0.2s ease-in-out 0s; -o-transition: all 0.2s ease-in-out 0s; -webkit-transition: all 0.2s ease-in-out 0s;}/*名为sild_top的div动画效果设置开始*/.both_sild_menu:hover .sild_top{ /*当鼠标悬浮在框架上时，将名为sild_top的div透明度变为1*/ opacity: 1;}.both_sild_menu:hover .sild_top{ /*当鼠标悬浮在框架上时，将名为sild_top的div从初始的Y轴40px移动到Y轴0px位置*/ transform: translate(0,0); -moz-transform: translate(0,0); -o-transform: translate(0,0); -ms-transform: translate(0,0); -webkit-transform: translate(0,0);}/*名为sild_top的div动画效果设置结束*//*名为sild_bottom的div动效果设置画开始*/.both_sild_menu:hover .sild_bottom{ opacity: 1;}.both_sild_menu:hover .sild_bottom{ transform: translate(0,0); -moz-transform: translate(0,0); -o-transform: translate(0,0); -ms-transform: translate(0,0); -webkit-transform: translate(0,0);}/*名为sild_bottom的div动画效果设置结束*/原理我已经说的很清楚了，配合上面的程序应该很容易看出来吧~~~~~
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