来自IBM中文官方网站的导航条渐隐特效代码-JS特效-爱易网页

来自IBM中文官方网站的导航条渐隐特效代码

日期：2014-05-18　浏览次数：20313 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>IBM官网导航条效果</title>
<style>
body,div,ul,li{margin:0;padding:0;}
body{height:2000px;background:#F0F0F0;}
li{list-style:none;}
a:link,a:visited{outline:none;text-decoration:none;}
#wrap{width:100%;position:fixed;top:0;}
#topBar{color:#7A7A7A;height:28px;background:#131623;overflow:hidden;font:12px/28px Arial;text-align:center;}
#topBar a{color:#FFF;background:#7A7A7A;padding:2px 5px;border-radius:10px;}
#nav{height:50px;overflow:hidden;border-top:1px solid #999;border-bottom::1px solid #666;background:#000 url(http://www.aiyiweb.com/web/UploadPic/2011-12/2011122131216590.png) repeat-x;}
#nav .logo{float:left;margin:0 20px;}
#nav .logo a{float:left;width:100px;height:50px;overflow:hidden;text-indent:-9999px;background:url(http://www.aiyiweb.com/web/UploadPic/2011-12/2011122131214364.png) no-repeat;}
#nav .logo a:hover{background-position:0 -50px;}
#nav.hide .logo a{width:100px;height:30px;background-position:0 -100px;_background-position:0 -130px;}
#nav.hide .logo a:hover{background-position:0 -130px;}
#nav ul,#nav ul li{float:left;}
#nav ul li a{float:left;color:#CCC;height:50px;font:16px/50px Arial;padding:0 20px;}
#nav ul li a:hover{color:#FFF;background:url(http://www.aiyiweb.com/web/UploadPic/2011-12/2011122131216590.png) 0 -50px repeat-x;}
#nav.hide ul{display:none;}
</style>
<script>
var fgm = {
 shit: !-[1,] && !window.XMLHttpRequest, 
 scrollTop: function() {
  return document.documentElement.scrollTop || document.body.scrollTop;
 },
 currentStyle: function(obj, attr) {
  return parseInt(obj.currentStyle ? obj.currentStyle[attr] : getComputedStyle(obj, null)[attr]);
 },
 fixed: function(element) {
  if(this.shit) {
   var top = this.currentStyle(element, "top") || 0,
   dd = "(document.documentElement)";
   document.documentElement.style.textOverflow = "ellipsis";
   element.style.position = "absolute";
   element.style.setExpression("top", "eval(" + dd + ".scrollTop + " + (top - this.scrollTop()) + ') + "px"');
  }
  else {
   element.style.position = "fixed"; 
  }
 },
 doMove: function(obj, iTarget, callback) {
  clearInterval(obj.timer);
  obj.timer = setInterval(function() {
   var iCur = fgm.currentStyle(obj, "height"),
   iSpeed = (iTarget - iCur) / 5;
   iSpeed = iSpeed > 0 ? Math.ceil(iSpeed) : Math.floor(iSpeed);
   iTarget == iCur ? (clearInterval(obj.timer), callback && callback.call(obj)) : obj.style.height = iSpeed + iCur + "px";
  }, 30);  
 }
};
window.onload = function() {
 var oWrap = document.getElementById("wrap"),
 oTopBar = document.getElementById("topBar"),
 oNav = document.getElementById("nav"),
 fnStatus = function(status) {
  !!status ?
  (function() {
   oNav.className = "hide";
   fgm.doMove(oTopBar, 4);
   fgm.doMove(oNav, 30);
  })() :
  (function() {
   fgm.doMove(oTopBar, 28);
   fgm.doMove(oNav, 50, function() {
    this.className = "" ;
   })
  })();
 }; 
 fgm.fixed(oWrap);//IE6 Fixed
 window.onscroll = function() {
  var iScrollTop = fgm.scrollTop();
  fnStatus(iScrollTop > 0);
  document.onmouseover = function(ev) {
   var oEv = ev || event,
   oTarget = oEv.target || oEv.srcElement,
   contains = function() {
    if(oWrap.contains) {
     return oWrap.contains(oTarget); 
    }
    else if(oWrap.compareDocumentPosition) {
     retur</div></div>

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