js 滑动带缓冲的二级菜单导航菜单

时间：2009-06-24 编辑：简简单单来源：一聚教程网

提示：您可以先修改部分代码再运行

body {font:12px "宋体";background:#000000;}
body,div,ul,li{padding:0;margin:0;}
a{text-decoration:none;color:#fff;}
#body{margin:0 auto;}
#header{}
#nav1{top:214px;}
.dropdown{position:relative;float:left;padding:0 0 3px 0;margin-top:0px;}
*+html .dropdown{padding:14px 0 3px 0;_padding:0 0 3px 0;margin-top:0px;}
.dropdown DT{padding:12px 0 8px 0;cursor: pointer;color:#fff;text-align:center;}
* html .dropdown DT{padding:0 0 8px 0;}
*+html .dropdown DT{padding:0 0 8px 0;}
.dropdown a{text-align:center;}
.dropdown DD{z-index:99999;position:absolute;display:none;overflow:hidden;opacity:0;margin-left:-2px;}
.dropdown UL{list-style-type:none; }
.dropdown LI{display:inline;}
html>body .dropdown UL a{display:block;background:url(http://www.111com.net/notfound.jpg) no-repeat;color:#fff;text-decoration:none;line-}
html>body .dropdown UL a:hover{background:url(http://www.111com.net/notfound.jpg) no-repeat;color: #fff}
* html .dropdown UL a{display:block;filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled=true, sizingMethod=crop, src="http://www.111com.net/notfound.jpg");color:#fff;text-decoration:none;line-cursor:hand;}
* html .dropdown UL a:hover{filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled=true, sizingMethod=crop, src="http://www.111com.net/notfound.jpg");color: #fff}
.dropdown .underline{margin-top:1px;}</style></p>
<script language="javascript">
var DDSPEED = 10;
var DDTIMER = 15;
// main function to handle the mouse events //
function ddMenu(id,d)
{
    var h = document.getElementById(id + '-ddheader');
    var c = document.getElementById(id + '-ddcontent');
    clearInterval(c.timer);
    if(d == 1)
    {
        clearTimeout(h.timer);
        if(c.maxh && c.maxh <= c.offsetHeight)
        {
            return;
        }
        else if(!c.maxh)
        {
            c.style.top = '-' + c.offsetHeight + 'px';
            c.style.display = 'block';
            c.style.;
            c.maxh = c.offsetHeight;
            c.style.;
        }
        c.timer = setInterval(function(){ddSlide(c,1)},DDTIMER);
    }
    else
    {
        h.timer = setTimeout(function(){ddCollapse(c)},50);
    }
}
// collapse the menu //
function ddCollapse(c){
  c.timer = setInterval(function(){ddSlide(c,-1)},DDTIMER);
}
// cancel the collapse if a user rolls over the dropdown cent //
function cancelHide(id){
  var h = document.getElementById(id + '-ddheader');
  var c = document.getElementById(id + '-ddcontent');
  clearTimeout(h.timer);
  clearInterval(c.timer);
  if(c.offsetHeight < c.maxh){
    c.timer = setInterval(function(){ddSlide(c,1)},DDTIMER);
  }
}
// incrementally expand/contract the dropdown and change the opacity //
function ddSlide(c,d){
  var currh = c.offsetHeight;
  var dist;
  if(d == 1){
    dist = (Math.round((c.maxh - currh) / DDSPEED));
  }else{
    dist = (Math.round(currh / DDSPEED));
  }
  if(dist <= 1 && d == 1){
    dist = 1;
  }
  c.style.top = parseInt(c.style.top.replace('px','')) - parseInt(dist * d) + 'px';
  c.style.px';
  if(getOs()=="Firefox")
  {	
    c.style.opacity = currh / c.maxh;
    c.style.filter = 'alpha(opacity=' + (currh * 100 / c.maxh) + ')';
  }
  if((currh < 2 && d != 1) || (currh > (c.maxh - 2) && d == 1)){
      clearInterval(c.timer);
  }
}
function getOs() 
{ 
   var OsObject = ""; 
   if(navigator.userAgent.indexOf("MSIE")>0) { 
        return "MSIE"; 
   } 
   if(isFirefox=navigator.userAgent.indexOf("Firefox")>0){ 
        return "Firefox"; 
   } 
   if(isSafari=navigator.userAgent.indexOf("Safari")>0) { 
        return "Safari"; 
   }  
   if(isCamino=navigator.userAgent.indexOf("Camino")>0){ 
        return "Camino"; 
   } 
   if(isMozilla=navigator.userAgent.indexOf("Gecko/")>0){ 
        return "Gecko"; 
   } 
} 
</script>
<div id="body">
<div id="header">
<div><a href="https://img.111com.net/get_pic/20090624091354436.jpg" class="js-smartPhoto-pc" target="_blank"><img     alt="" src="https://img.111com.net/get_pic/20090624091354436.jpg" /></a></div>
<div id="nav1"><dl class="dropdown"><dt id="m1-ddheader" onmouseout="ddMenu('m1',-1)" onMouseOver="ddMenu('m1',1)"><a href="javascript:void(null);">导航菜单</a> </dt><dd id="m1-ddcontent" onmouseout="ddMenu('m1',-1)" onMouseOver="cancelHide('m1')">
<ul>
    <li><a href="javascript:void(null);">栏目菜单</a></li>
</ul>
</dd></dl><dl class="dropdown"><dt id="m2-ddheader" onmouseout="ddMenu('m2',-1)" onMouseOver="ddMenu('m2',1)"><a href="javascript:void(null);">导航菜单</a> </dt><dd id="m2-ddcontent" onmouseout="ddMenu('m2',-1)" onMouseOver="cancelHide('m2')">
<ul>
    <li><a href="javascript:void(null);">栏目菜单</a></li>
    <li><a href="javascript:void(null);">栏目菜单</a></li>
</ul>
</dd></dl><dl class="dropdown"><dt id="m3-ddheader" onmouseout="ddMenu('m3',-1)" onMouseOver="ddMenu('m3',1)"><a href="javascript:void(null);">导航菜单</a> </dt><dd id="m3-ddcontent" onmouseout="ddMenu('m3',-1)" onMouseOver="cancelHide('m3')">
<ul>
    <li><a href="javascript:void(null);">栏目菜单</a></li>
    <li><a href="javascript:void(null);">栏目菜单</a></li>
    <li><a href="javascript:void(null);">栏目菜单</a></li>
</ul>
</dd></dl><dl class="dropdown"><dt id="m4-ddheader" onmouseout="ddMenu('m4',-1)" onMouseOver="ddMenu('m4',1)"><a href="javascript:void(null);">导航菜单</a> </dt><dd id="m4-ddcontent" onmouseout="ddMenu('m4',-1)" onMouseOver="cancelHide('m4')">
<ul>
    <li><a href="javascript:void(null);">栏目菜单</a></li>
    <li><a href="javascript:void(null);">栏目菜单</a></li>
    <li><a href="javascript:void(null);">栏目菜单</a></li>
    <li><a href="javascript:void(null);">栏目菜单</a></li>
</ul>
</dd></dl><dl class="dropdown"><dt id="m5-ddheader" onmouseout="ddMenu('m5',-1)" onMouseOver="ddMenu('m5',1)"><a href="javascript:void(null);">导航菜单</a> </dt><dd id="m5-ddcontent" onmouseout="ddMenu('m5',-1)" onMouseOver="cancelHide('m5')">
<ul>
    <li><a href="javascript:void(null);">栏目菜单</a></li>
    <li><a href="javascript:void(null);">栏目菜单</a></li>
    <li><a href="javascript:void(null);">栏目菜单</a></li>
    <li><a href="javascript:void(null);">栏目菜单</a></li>
    <li><a href="javascript:void(null);">栏目菜单</a></li>
</ul>
</dd></dl><dl class="dropdown"><dt id="m6-ddheader" onmouseout="ddMenu('m6',-1)" onMouseOver="ddMenu('m6',1)"><a href="javascript:void(null);">导航菜单</a> </dt><dd id="m6-ddcontent" onmouseout="ddMenu('m6',-1)" onMouseOver="cancelHide('m6')">
<ul>
    <li><a href="javascript:void(null);">栏目菜单</a></li>
    <li><a href="javascript:void(null);">栏目菜单</a></li>
    <li><a href="javascript:void(null);">栏目菜单</a></li>
    <li><a href="javascript:void(null);">栏目菜单</a></li>
    <li><a href="javascript:void(null);">栏目菜单</a></li>
</ul>
</dd></dl><dl class="dropdown"><dt id="m7-ddheader" onmouseout="ddMenu('m7',-1)" onMouseOver="ddMenu('m7',1)"><a href="javascript:void(null);">导航菜单</a> </dt><dd id="m7-ddcontent" onmouseout="ddMenu('m7',-1)" onMouseOver="cancelHide('m7')">
<ul>
    <li><a href="javascript:void(null);">栏目菜单</a></li>
    <li><a href="javascript:void(null);">栏目菜单</a></li>
    <li><a href="javascript:void(null);">栏目菜单</a></li>
    <li><a href="javascript:void(null);">栏目菜单</a></li>
</ul>
</dd></dl><dl class="dropdown"><dt id="m8-ddheader" onmouseout="ddMenu('m8',-1)" onMouseOver="ddMenu('m8',1)"><a href="javascript:void(null);">导航菜单</a> </dt><dd id="m8-ddcontent" onmouseout="ddMenu('m8',-1)" onMouseOver="cancelHide('m8')">
<ul>
    <li><a href="javascript:void(null);">栏目菜单</a></li>
    <li><a href="javascript:void(null);">栏目菜单</a></li>
    <li><a href="javascript:void(null);">栏目菜单</a></li>
</ul>
</dd></dl><dl class="dropdown"><dt id="m9-ddheader" onmouseout="ddMenu('m9',-1)" onMouseOver="ddMenu('m9',1)"><a href="javascript:void(null);">导航菜单</a> </dt><dd id="m9-ddcontent" onmouseout="ddMenu('m9',-1)" onMouseOver="cancelHide('m9')">
<ul>
    <li><a href="javascript:void(null);">栏目菜单</a></li>
    <li><a href="javascript:void(null);">栏目菜单</a></li>
</ul>
</dd></dl><dl class="dropdown"><dt id="m10-ddheader" onmouseout="ddMenu('m10',-1)" onMouseOver="ddMenu('m10',1)"><a href="javascript:void(null);">导航菜单</a> </dt><dd id="m10-ddcontent" onmouseout="ddMenu('m10',-1)" onMouseOver="cancelHide('m10')">
<ul>
    <li><a href="javascript:void(null);">栏目菜单</a></li>
</ul>
</dd></dl></div>
</div>
</div>
<p><a href=http://www.111com.net>中国WEB第一站</a></p>

提示：您可以先修改部分代码再运行

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