站长之家chinaz.com网站导航代码-JS特效-爱易网页

站长之家chinaz.com网站导航代码

日期：2014-05-18　浏览次数：20297 次

以下是程序代码

<!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>setTimeout应用 特效演示 by js.aiyiweb.com</title>
<style>
body,div,ul,li,p{margin:0;padding:0;}
body{font:12px/1.5 Arial;}
ul{list-style-type:none;}
#nav,#nav ul,#nav ul li,#nav ul li a:hover,#nav .subnav,#nav .subnav p,#nav .subnav p span,#nav .subnav .arrow{background:url(http://js.fgm.cc/learn/lesson4/img/nav_bg.png) no-repeat;}
#nav{position:relative;width:910px;background-position:0 -36px;margin:10px auto;}
#nav ul{height:36px;line-height:36px;margin-left:10px;padding-right:10px;overflow:hidden;background-position:right -72px;}
#nav ul li{float:left;width:110px;margin-left:-2px;background-position:0 -108px;}
#nav ul li a{font-size:14px;color:#fff;width:102px;display:block;text-align:center;text-decoration:none;margin:0 2px 0 4px;}
#nav ul li a:hover{font-weight:700;background-position:-3px -144px;}
#nav .subnav{display:none;position:absolute;top:41px;width:auto!important;min-width:110px;height:27px;line-height:27px;white-space:nowrap;background-position:0 -180px;}
#nav .subnav p{margin-left:10px;padding-right:10px;background-position:right -234px;}
#nav .subnav p span{display:block;color:#235e99;background-repeat:repeat-x;background-position:0 -207px;}
#nav .subnav p a{font-size:12px;display:inline;color:#235e99;text-decoration:none;margin:0 5px;padding:0 2px;}
#nav .subnav p a:hover{font-weight:400;background-image:none;border-bottom:2px solid;}
#nav .subnav .arrow{position:absolute;top:-4px;display:block;width:11px;height:5px;background-position:0 -261px;}
</style>
<script type="text/javascript">
var get = {
 byId: function(id) {
  return document.getElementById(id)
 },
 byClass: function(sClass, oParent) {
  var aClass = [];
  var reClass = new RegExp("(^| )" + sClass + "( |$)");
  var aElem = this.byTagName("*", oParent);
  for (var i = 0; i < aElem.length; i++) reClass.test(aElem[i].className) && aClass.push(aElem[i]);
  return aClass
 },
 byTagName: function(elem, obj) {
  return (obj || document).getElementsByTagName(elem)
 }
};
window.onload = function ()
{
 var oNav = get.byId("nav");
 var aLi = get.byTagName("li", oNav);
 var aSubNav = get.byClass("subnav", oNav);
 var oSubNav = oEm = timer = null;
 var i = 0;
 
 for (i = 1; i < aLi.length; i++)
 {
  aLi[i].onmouseover = function ()
  {
   //隐藏所有子菜单
   for (i = 0; i < aSubNav.length; i++)aSubNav[i].style.display = "none";
   
   //获取该项下的子菜单
   oSubNav = get.byClass("subnav", this)[0];
   
   //获取该项下的指示箭头
   oEm = get.byTagName("em", this)[0];
   
   //显示该项下的子菜单
   oSubNav.style.display = "block";
   
   //判断显示区域
   oNav.offsetWidth - this.offsetLeft > oSubNav.offsetWidth ? 
   
   //如果在显示范围居左显示
   oSubNav.style.left = this.offsetLeft + "px" :
   
   //超出显示范围居右显示
   oSubNav.style.right = 0;
   
   //计算指标箭头显示位置
   oEm.style.left = this.offsetLeft - oSubNav.offsetLeft + 50 + "px";
   clearTimeout(timer);
   
   //阻止事件冒泡
   oSubNav.onmouseover = function (event)
   {
    (event || window.event).cancelBubble = true;
    clearTimeout(timer)
   }
  };
  
  aLi[i].onmouseout = function ()
  {
   timer = setTimeout(function () {
    oSubNav.style.display = "none"
   },300) 
  }
 }
};
</script>
</head>
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