CSS+JS感应鼠标展开的的二级下拉菜单

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    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
    <title>CSS+JS感应鼠标展开的的二级下拉菜单丨</title>
    <meta http-equiv="content-type" content="text/html;charset=gb2312">
    <style type="text/css">
    *{margin:0;padding:0;font-style:normal;font-family:宋体;}
    body{text-align:center;font-size:14px;}
    #content{margin:0 auto;width:600px;}
    #content #nav{background:#000000;height:32px;margin-top:10px;}
    #content #nav ul{list-style:none;}
    #content #nav ul li{float:left;width:100px;line-height:32px;position:relative;}
    #nav div{width:100px;position:absolute;left:0px;padding-bottom:0px;background:#000000;float:left;height:0;overflow:hidden;}
    #content #nav li .a{text-decoration:none;color:#00CD00;line-height:32px;display:block;border-right:1px solid #009800;}
    #nav div a{text-decoration:none;color:#00CD00;line-height:26px;display:block;}
    #nav div a:hover{background:#005400;}
    </style>
    </head>
    <body>
    <div id="content">
    <div id="nav">
    <ul id="supnav">
    <li><a href="#" class="a">菜单测试</a>
    <div>
    <a href="#">菜单测试</a>
    <a href="#">菜单测试</a>
    <a href="#">菜单测试</a>
    </div>
    </li>
    <li><a href="#" class="a">网页特效</a>
    <div>
    </a>
    </div>
    </li>
    <li><a href="#" class="a">菜单测试</a>
    <div>
    <a href="#">菜单测试</a>
    <a href="#">菜单测试</a>
    <a href="#">菜单测试</a>
    <a href="#">菜单测试</a>
    <a href="#">菜单测试</a>
    </div>
    </li>
    <li><a href="#" class="a">菜单测试</a>
    <div>
    <a href="#">菜单测试</a>
    <a href="#">菜单测试</a>
    <a href="#">菜单测试</a>
    </div>
    </li>
    <li><a href="#" class="a">菜单测试</a>
    <div>
    <a href="#">菜单测试</a>
    <a href="#">菜单测试</a>
    <a href="hongshan1998.com.cn">菜单测试</a>
    <a href="http://www.ylxxhs.net/">菜单测试</a>
    </div>
    </li>
    <li><a href="#" class="a">菜单测试</a>
    <div>
    <a href="#">菜单测试</a>
    <a href="#">菜单测试</a>
    <a href="#">菜单测试</a>
    </div>
    </li>
    </ul>
    </div>
    </div>
    <script type="text/javascript">
    var supnav=document.getElementById("supnav");
    var nav=document.getElementById("nav");
    var btns=document.getElementsByTagName("li");
    var subnavs=nav.getElementsByTagName("div");
    var paddingbottom=20;
    var defaultHeight=0;
    function drop(obj,ivalue){
    var a=obj.offsetHeight;
    var speed=(ivalue-obj.offsetHeight)/8;
    a+=Math.floor(speed);
    obj.style.height=a+"px";
    }
    window.onload=function(){
    for(var i=0;i<btns.length;i++){
    btns[i].index=i;
    btns[i].onmouseover=function(){
    var osubnav=subnavs[this.index];
    var sublinks=osubnav.getElementsByTagName("a");
    if(osubnav.firstChild.tagName==undefined){
    var itarheight=parseInt(osubnav.childNodes[1].offsetHeight)*sublinks.length+paddingbottom;
    }else{
    var itarheight=parseInt(osubnav.firstChild.offsetHeight)*sublinks.length+paddingbottom;
    }
    clearInterval(this.itimer);
    this.itimer=setInterval(function(){drop(osubnav,itarheight);},30);
    }
    btns[i].onmouseout=function(){
    var osubnav=subnavs[this.index];
    clearInterval(this.itimer);
    this.itimer=setInterval(function(){drop(osubnav,defaultHeight);},30);
    }
    }
    }
    </script>
    </body>
    </html>
    <br><br><br><br><br><br> <br><hr>
    

 

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