Web前端开发实战1:二级下拉式菜单之CSS实现_html/css_WEB-ITnose
二级下拉式菜单在各大学校网站,电商类网站,新闻类网站等大型?网站很常见,那么它的实现原理是什么呢?
学习了Web前端开发的知识后,我们是可以实现这样的功能的。复杂的都是从基础效果上添加做出来的,原理和流程
还是一样的,今天开始做一些简单的二级下拉式菜单。
横向一级菜单我们见到的很多,如下图所示是:
二级下拉菜单图:
二级下拉菜单是在横向一级菜单的基础上添加下拉效果实现的,制作思路:
第一步:静态网页的制作
标签
- ...
标签链接
float浮动
display:block属性
postion属性规定元素的定位
第二步:动态特效的实现
下拉菜单的显示与隐藏
今天我们使用CSS样式表实现,那么制作流程是:
1一级菜单设置:设置CSS样式,使一级菜单横向显示,位于一行中。
2二级菜单设置:给”课程大厅”菜单,添加二级菜单(JavScript/JQuery/Ajax三项),并带链接;同时给“学习中心”菜
单,添加二级菜单(视频学习/案例学习/交流平台三项),也带链接。
3隐藏二级菜单: 设置CSS样式,让二级菜单隐藏。
4显示二级菜单:设置CSS样式,让二级菜单显示。
5浏览器兼容性问题解决以及代码优化,至少测试五个浏览器。我测试的是IE7,8,9,2345浏览器,谷歌浏览器以
及火狐浏览器。
HTML代码部分:
<span style="font-size:18px;"><meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title>涓</title></span>

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