html 仿百度百科导航下拉菜单功能，具体代码如下所示：
演示图1
html+CSS仿百度百科导航下拉菜单
样式
body{margin:0;padding:0;font-family:arial,tahoma,'Microsoft Yahei','5b8b4f53',sans-serif;;}
.top-bar{background-color:#f3f3f3;text-align:center;padding:2.5em;}
a{padding-bottom:3px;color:white;text-decoration:none;}
ul{list-style:none;padding:0;margin:0;}
li{text-align:center;}
.nav-bar{position:relative;z-index:1000;overflow:hidden;min-width:900px;height:45px;}
.nav-bar:hover{overflow:visible;-webkit-transition:all 0.5s ease;transition:all 0.5s ease;}
.nav-bg{position:absolute;width:100%;height:272px;background:#24619c;background:rgba(36,97,158,.95);-webkit-transition:.3s;transition:.3s;z-index:9999;}
.nav-top{height:43px;border-top:1px solid #5895d5;border-bottom:1px solid #3b92e9;background:#459df5;}
.nav-content{position:absolute;width:80%;left:10%;}
.nav-content-box{position:absolute;top:0;left:0;width:100%;}
.nav-content-box>li{float:left;line-height:43px;}
.nav-content-box>li:hover{background:#19508b;}
.nav-content-box>li>span>a{display:block;width:100%;margin:0;height:41px;line-height:41px;}
.nav-content-box>li:hover>span>a{background:#338ce6;}
ul>li.index,ul>li.cat,ul>li.special,ul>li.user,ul>li.cooperation,ul>li.mobile{width:120px;}
ul>li.index{height:43px;}
ul.nav-content-box>li>ul{border-right:solid 1px #3a6fa2;margin:10px 0 6px}
ul.nav-content-box>li>ul:after{visibility:hidden;display:block;font-size:0;content:" ";clear:both;height:0}
.nav-content-box>li:hover>ul{border-right:none;padding-right:1px;}
ul.nav-content-box>li>ul>li{float:left;width:100%;line-height:2;text-align:center;}
ul.nav-content-box>li.cat>ul>li{width:49%;}
ul.nav-content-box>li>ul>li>a{display:block;width:100%;}
总结
以上所述是小编给大家介绍的html 仿百度百科导航下拉菜单功能,希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对IT俱乐部网站的支持！
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