CSS+JS实现兼容性很好的无限级下拉菜单

  作者:会飞的

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"><html xmlns="http://www.w3.org/1999/xhtml" xml:l

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> 

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">

<head>

<title>CSS+JS实现兼容性很好的无限级下拉菜单</title>

<style type="text/css">

*{ margin:0; padding:0; border:0;}

body{font:12px/130% verdana,geneva,arial,helvetica,sans-serif,宋体;}li{list-style:none;}

.clearfix:after{content:" ";display:block;height:0;clear:both;visibility:hidden;}.clearfix{display:inline-block;}

a:link{ color:#000; text-decoration:none; }

a:visited{ color:#000; text-decoration:none; }

a:hover{ color:#000; text-decoration:none; }

.menu{ width:778px; height:26px; background:#fff; margin:0 auto;}

.menusel{ float:left;width:100px; position:relative; height:25px; background:#ddd; line-height: 25px; margin-left: 1px; *margin-left: 0px;_margin-left: -1px;}

.menusel h2{ font-size:12px; }

.menusel a{ display: block;text-align:center; width:100px;border:1px solid #a4a4a4; height:25px; border-bottom:1px solid #a4a4a4; position:relative; z-index:2;}

.menusel a:hover{ border:1px solid #a4a4a4; border-bottom:1px dashed #eeeeee; position:relative; z-index:2; height:25px;}

.ahover a{border-bottom:1px dashed #eeeeee; background:#eeeeee; }

.position{ position:absolute; z-index:1;}

.menusel ul{width:125px; background:#eee; border:1px solid #a4a4a4; margin-top: -1px; position:relative; z-index:1; display:none;}

.menusel .block{ display:block;}

.typeul li{border-bottom:1px dashed #a4a4a4;width:125px; position:relative; float:left; }

.typeul li a{ border:none;width:125px; }

.typeul li a:hover{ border:none; background:#ddd;}

.typeul{  margin-left:0;  }

.typeul ul{left:125px; top:0; position:absolute;}

.fli{ margin-left: -1px; border-left:#eeeeee solid 1px;}

.menusel .lli{ border:none; }

</style>

<script type="text/javascript">document.execCommand("BackgroundImageCache", false, true);</script><!-- IE6背景图片闪烁问题  -->

</head>

<body>

<div>

 <div id="menu1">

  <h2><a href="/">菜单1</a></h2>

   <div>

    <ul class="clearfix typeul">

     <li><a href="http://www.33567.cn">菜单选项1-2</a></li>

     <li>

      <a href="#">菜单选项1-2</a>

      <ul>

       <li><a href="#">菜单选项1-2-1</a></li>

       <li><a href="#">菜单选项1-2-2</a></li>

      </ul>

     </li>

     <li><a href="http://www.7caidy.com">菜单选项1-2</a></li>

     <li><a href="#">菜单选项1-2</a></li>

    </ul>

   </div><!-- position -->

  </div><!-- menusel -->

  <div id="menu2">

  <h2><a href="#">菜单2</a></h2>

  <div>

  <ul class="clearfix typeul">

  <li><a href="#">菜单选项2-2</a></li>

  <li><a href="#">菜单选项2-2</a>

  <ul>

  <li><a href="#">菜单选项2-2-1</a></li>

  <li><a href="#">菜单选项2-2-2</a>

  <ul>

  <li><a href="#">菜单选项2-2-1</a></li>

  <li><a href="#">菜单选项2-2-2</a>

  </li>

  </ul>

  </li>

  </ul>

  </li>

  <li><a href="#">菜单选项2-2</a></li>

  <li><a href="#">菜单选项2-2</a></li>

  </ul>

  </div><!-- position -->

  </div><!-- menusel -->

  <div id="menu3">

  <h2><a href="#">菜单3</a></h2>

  <div>

  <ul class="clearfix typeul">

  <li><a href="#">菜单选项3-2</a></li>

  <li><a href="#">菜单选项3-2</a>

  <ul>

  <li><a href="#">菜单选项3-2-1</a></li>

  <li><a href="#">菜单选项3-2-2</a>

  <ul>

  <li><a href="#">菜单选项3-2-1</a></li>

  <li><a href="#">菜单选项3-2-2</a>

  <ul>

  <li><a href="#">菜单选项3-2-1</a></li>

  <li><a href="#">菜单选项3-2-2</a></li>

  </ul>

  </li>

  </ul>

  </li>

  </ul>

  </li>

  <li><a href="#">菜单选项3-2</a></li>

  <li><a href="#">菜单选项3-2</a></li>

  </ul>

  </div><!-- position -->

 </div><!-- menusel -->

</div><!-- menu -->

 <script type="text/javascript">

 for(var x = 1; x < 4; x++)

 {

 var menuid = document.getElementById("menu"+x);

 menuid.num = x;

 type();

 }

 function type()

 {

 var menuh2 = menuid.getElementsByTagName("h2");

 var menuul = menuid.getElementsByTagName("ul");

 var menuli = menuul[0].getElementsByTagName("li");

 menuh2[0].onmouseover = show;

 menuh2[0].onmouseout = unshow;

 menuul[0].onmouseover = show;

 menuul[0].onmouseout = unshow;

 function show()

 {

 menuul[0].className = "clearfix typeul block"

 }

 function unshow()

 {

 menuul[0].className = "typeul"

 }

 for(var i = 0; i < menuli.length; i++)

  {

  menuli[i].num = i;

  var liul = menuli[i].getElementsByTagName("ul")[0];

   if(liul)

   {

   typeshow()

   }

  }

 function typeshow()

 {

 menuli[i].onmouseover = showul;

 menuli[i].onmouseout = unshowul;

 }

 function showul()

 {

 menuli[this.num].getElementsByTagName("ul")[0].className = "block";

 }

 function unshowul()

 {

 menuli[this.num].getElementsByTagName("ul")[0].className = "";

 }

 }

 </script>

</body>

</html>