• 分别用html+css,js,jquery实现二级下拉列表


    <!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>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>无标题文档</title>
    <style type="text/css">
    *{ margin:0px; padding:0px;}
     #menu{ background-color:#eee; width:600px; height:40px; margin:0 auto;}
     ul{ list-style:none;}
     ul li{ float:left;  line-height:40px; text-align:center; position:relative;}
     a{ text-decoration:none; color:#000; display:block; width:90px;}
     a:hover{ color:#FFF; background-color:#666;}
     ul li ul li{ float:none; border-left:none; margin-top:2px; background-color:#eee; } 
     ul li ul{   display:none; width:90px; position:absolute;}
     ul li:hover ul{ display:block;}
      
     
    </style>
    </head>
    
    <body>
    <div id="menu">
       <ul>
       
      <li><a href="#">首页</a></li>
      <li><a href="#">课程大厅</a>
          <ul>
      
       <li><a href="#">JavaScript</a></li>
      <li><a href="#">jQuery</a></li>
      
          </ul>
      
      </li>
      <li><a href="#">学习中心</a>
        <ul>
        <li><a href="#">视频学习</a></li>
          <li><a href="#">案例学习</a></li>
          <li><a href="#">交流平台</a></li>
          </ul>
      </li>
      <li><a href="#">经典案例</a></li>
      <li><a href="#">关于我们</a></li>
      
    </ul>
    
    
    </div> 
              </body>
    </html>
    <!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>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>无标题文档</title>
    <style type="text/css">
    *{ margin:0px; padding:0px;}
    body{ font-family:Verdana, Geneva, sans-serif; font-size:14px;}
    #nav{ width:600px; height:40px; background-color:#eee; margin:0 auto;}
    ul{ list-style:none;}
    ul li{ float:left; line-height:40px; text-align:center; width:100px;}
    
    a{ text-decoration:none; color:#000; display:block;}
    a:hover{ color:#F00; background-color:#666;}
    
    
    
    ul li ul li{ float:none;background-color:#eee; margin:2px 0px;}
    
    ul li ul{ display:none;}
    
    
    
    </style>
    
     <script type="text/javascript">
    
            function displaySubMenu(li) {
    
                var subMenu = li.getElementsByTagName("ul")[0];
    
                subMenu.style.display = "block";
    
            }
    
            function hideSubMenu(li) {
    
                var subMenu = li.getElementsByTagName("ul")[0];
    
                subMenu.style.display = "none";
    
            }
    
        </script>
    </head>
    
    <body>
    <div id="nav">
    <ul>
      <li><a href="#">首页</a></li>
      <li onmouseover="displaySubMenu(this)" onmouseout="hideSubMenu(this)"><a href="#">课程大厅</a>
         <ul>
             <li><a href="#">JavaScript</a></li>
             <li><a href="#">Html/CSS</a></li>
         </ul>  
      </li>
      <li onmouseover="displaySubMenu(this)" onmouseout="hideSubMenu(this)"><a href="#">学习中心</a>
          <ul>
             <li><a href="#">视频学习</a></li>
             <li><a href="#">实例练习</a></li>
             <li><a href="#">问与答</a></li>
         </ul>  
      
      </li>
      <li><a href="#">经典案例</a></li>
      <li><a href="#">关于我们</a></li>
      
    </ul>
    
    </div>
    </body>
    </html>
    <!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>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>无标题文档</title>
    <style type="text/css">
    *{ margin:0px; padding:0px;}
     #menu{ background-color:#eee; width:600px; height:40px; margin:0 auto;}
     ul{ list-style:none;}
     ul li{ float:left;  line-height:40px; text-align:center; position:relative;}
     a{ text-decoration:none; color:#000; display:block; width:90px;}
     a:hover{ color:#FFF; background-color:#666;}
     ul li ul li{ float:none; border-left:none; margin-top:2px; background-color:#eee; } 
     ul li ul{  width:90px; position:absolute; left:0px; top:40px; display:none;}
     
    </style>
    <script src="jquery/jquery-1.7.1.min.js"></script>
    
    <script type="text/javascript">
      $(function(){
         $(".navmenu").mouseover(function(){
             $(this).children("ul").show();
             
             
             })
         $(".navmenu").mouseout(function(){
             
             $(this).children("ul").hide();
             
             })
          
          })
      
    </script>
    
    </head>
    
    <body>
    <div id="menu">
       <ul>
       
      <li><a href="#">首页</a></li>
      <li class="navmenu"><a href="#">课程大厅</a>
          <ul>  
             <li><a href="#">JavaScript</a></li>
             <li><a href="#">jQuery</a></li>
          </ul>
      
      </li>
      <li class="navmenu"><a href="#">学习中心</a>
          <ul>
             <li><a href="#">视频学习</a></li>
             <li><a href="#">案例学习</a></li>
             <li><a href="#">交流平台</a></li>
          </ul>
      </li>
      <li><a href="#">经典案例</a></li>
      <li><a href="#">关于我们</a></li>
      
    </ul>
    
    
    </div> 
              </body>
    </html>
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  • 原文地址:https://www.cnblogs.com/crazy-zw/p/5476525.html
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