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JS CSS implements simple secondary drop-down navigation menu effect_javascript skills

WBOYOriginal: 2016-05-16 15:38:331551browse

The example in this article describes how to implement a simple secondary drop-down navigation menu effect using JS CSS. Share it with everyone for your reference. The details are as follows:

This is a CSS and JavaScript to implement a two-level drop-down navigation menu. It seems that CSS needs to be combined with JS to achieve good results. This menu also uses JS. The menu currently supports two levels, and drop-down navigation is what we often use. It is a menu form. You can use it by modifying this. The structure is quite simple. I believe you will do it well.

The screenshot of the running effect is as follows:

The online demo address is as follows:

http://demo.jb51.net/js/2015/js-css-simple-2l-fade-down-menu-codes/

The specific code is as follows:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>CSS二级下拉导航菜单</title>
<meta http-equiv="content-type" content="text/html;charset=gb2312">
<style type="text/css">
body,html{padding:0;margin:0;text-align:center;font:normal 14px 'arial';}
#mainNavBar{width:100%;background:#999;padding:10px 0;}
#nav{width:760px;height:30px;margin:0 auto;}
#nav ul{padding:0;margin:0;}
#nav ul li{position:relative;float:left;width:60px;height:30px;line-height:30px;overflow:hidden;list-style-type:none;}
#nav ul li a{display:block;color:#fff;text-decoration:none;}
#nav ul li a:hover{font-weight:bold;background:#666;}
#subNav{position:absolute;width:150px;top:30px;left:0px;padding:5px;background:#666;color:#fff;text-align:left;}
#subNav a{text-decoration:none;font-weight:normal;display:block;}
#subNav a:hover{color:#f00;background:#f00;}
</style>
</head>
<body>
<div id="mainNavBar">
 <div id="nav">
  <ul>
   <li>
    <a href="#">添加</a>
    <div id="subNav">
     <a href="#">日志</a>
     <a href="#">分类</a>
    </div>
   </li>
   <li>
    <a href="#">管理</a>
    <div id="subNav">
     <a href="#">分类</a>
     <a href="#">文章</a>
    </div>
   </li>
   <li>
    <a href="#">扩展</a>
    <div id="subNav">
     <a href="#">评论管理</a>
     <a href="#">留言管理</a>
     <a href="#">注销退出</a>
    </div>
   </li>
  </ul>
 </div>
</div>
<script language="javascript">
var nav=document.getElementById("nav").getElementsByTagName("li");
for(i=0;i<nav.length;i++){
nav[i].onmouseover=function(){
 this.style.fontWeight="bold";
 this.style.overflow="visible";
 this.style.background="#666666";
 }
nav[i].onmouseout=function(){
 this.style.fontWeight="normal";
 this.style.background="#999999"
 this.style.overflow="hidden";
 }
}
</script>
</body>
</html>

I hope this article will be helpful to everyone’s JavaScript programming.

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