这是一款微软官网导航菜单，兼容好的下拉菜单，微软官网导航效果，在IE6下没有动画效果，顺便也把IE6的效果给加上，兼容IE6。现在微软的官方网站正在使用，我觉得非常不错。
运行效果截图如下：
在线演示地址如下：
具体代码如下：
<!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>微软官网导航菜单</title> <style type="text/css"> body{margin:0px;text-align:left;padding:0px;font:12px/140% Arial,Verdana,"微软雅黑";background:#d1d1d1;} ul{margin:0px;padding:0px;list-style-type:none;float:left;} a:focus {outline:0;} .nav{width:920px;height:28px;background:#f4f4f4;margin:20px auto;border-radius:5px;} .nav li{width:auto;line-height:20px;float:left;position:relative;} .nav li.msMnu_Item a{border:1px solid #f4f4f4;color:#4f4f4f;display:inline-block;padding:3px 10px;position:relative;text-decoration:none;font-size:14px;} .nav li.msMnu_Item a:hover{border:1px solid #999;background:#e4ecf4;} .nav li.msMnu_hove a{border:1px solid #999;border-bottom:1px solid #fff;background:#fff;color:#4f4f4f;display:inline-block;padding:3px 10px;position:relative;text-decoration:none;font-size:14px;z-index:1000;} .list{overflow:hidden;position:absolute;height:0px;top:27px;left:0;border-radius:0 8px 8px 8px;} .list div{background:#fff;overflow:hidden;padding:12px 0 12px 0;border:1px solid #999;float:left;} .list ul{padding:0px 10px;} .list li{margin:0px;padding:0px;width:170px;} .list li h3{margin:0px;padding:0px;font-size:12px;color:#4f4f4f;border-bottom:1px solid #e3e3e3;line-height:20px;width:100%;float:left;} .list li ul{width:170px;margin:0px;padding:5px 0;} .list li ul li.lis a{width:170px;height:22px;color:#0060a6;font-size:12px;line-height:20px;text-decoration:none;margin:0px;padding:0px;text-indent:3px;border:none;} .list li ul li.lis a:hover{color:#fff;background:#0060a6;} </style> <script type="text/javascript"> function Class(oParent, sClass){ var aElem = oParent.getElementsByTagName('*'); var aClass = []; var i = 0; for(i=0;i<aElem.length;i++)if(aElem[i].className == sClass)aClass.push(aElem[i]); return aClass; }; function css(obj, attr, value){ if(arguments.length == 2){ var style = obj.style, currentStyle = obj.currentStyle; if(typeof attr === 'string')return currentStyle ? currentStyle[attr] : getComputedStyle(obj, false)[attr]; for(var propName in attr)propName == 'opacity' ? (style.filter = "alpha(opacity=" + attr[propName] + ")", style.opacity = attr[propName] / 100) : style[propName] = attr[propName]; }else if(arguments.length == 3){ switch(attr){ case "width": case "height": case "paddingTop": case "paddingRight": case "paddingBottom": case "paddingLeft": case "top": case "right": case "bottom": case "left": case "marginTop": case "marginRigth": case "marginBottom": case "marginLeft": obj.style[attr] = value + "px"; break; case "opacity": obj.style.filter = "alpha(opacity=" + value + ")"; obj.style.opacity = value / 100; break; default: obj.style[attr] = value } } }; function extend(destination, source){ for (var propName in source) destination[propName] = source[propName]; return destination }; function doMove(obj, json, fnEnd){ clearInterval(obj.timer); obj.iSpeed = 0; fnEnd = extend({ type: "buffer", callback: function() {} }, fnEnd); obj.timer = setInterval(function(){ var iCur = 0, iStop = true; for(var propName in json){ iCur = parseFloat(css(obj, propName)); propName == 'opacity' && (iCur = Math.round(iCur * 100)); switch(fnEnd.type){ case 'buffer': obj.iSpeed = (json[propName] - iCur) / 3; obj.iSpeed = obj.iSpeed > 0 ? Math.ceil(obj.iSpeed) : Math.floor(obj.iSpeed); json[propName] == iCur || (iStop = false, css(obj, propName, iCur + obj.iSpeed)); break; case 'elasticity': obj.iSpeed += (json[propName] - iCur) / 3; obj.iSpeed *= 0.75; Math.abs(json[propName] - iCur) <= 1 && Math.abs(obj.iSpeed) <= 1 ? css(obj, propName, json[propName]) : css(obj, propName, json[propName]) || (iStop = false, css(obj, propName, iCur + obj.iSpeed)); break; case 'accelerate': obj.iSpeed = obj.iSpeed + 3; iCur >= json[propName] ? css(obj, propName, json[propName]) : css(obj, propName, json[propName]) || (iStop = false, css(obj, propName, iCur + obj.iSpeed)); break; } } if(iStop){ clearInterval(obj.timer); obj.timer = null; obj.iSpeed = 0; fnEnd.callback(); } },30); }; </script> <script type="text/javascript"> window.onload = function(){ var aMenu = Class(document, 'menu'); var aList = Class(document, 'list'); var i = iNow = zIndex = 0; for(i=0;i<aMenu.length;i++){ aMenu[i].index = i; aMenu[i].onclick = function(e){ var oEvent = e || event; var aDiv = this.parentNode.getElementsByTagName('div'); var aMenuList = Class(this.parentNode,'menuList'); var iWidth = aMenuList.length * aMenuList[0].offsetWidth + 3; //还原上一个动作 flexible(); if(aDiv[0].style.height==aDiv[1].offsetHeight+'px'){ flexible(); }else{ //当前动作 this.parentNode.className = 'msMnu_hove'; aDiv[0].style.zIndex = zIndex++; if(aMenuList.length>1)aDiv[0].style.width = iWidth + 'px'; doMove(aDiv[0], {height:aDiv[1].offsetHeight}); } //记住上一个 iNow = this.index; oEvent.cancelBubble = true; }; } document.onclick = function(){flexible();}; function flexible(){ aList[iNow].parentNode.className = 'msMnu_Item'; aList[iNow].style.zIndex = 0; doMove(aList[iNow], {height:0}); } }; </script> </head> <body> <div> <ul> <li> <a href="javascript:;">Windows</a> <div> <div> <ul> <li> <h3>Windows</h3> <ul> <li><a href="javascript:;">Windows 7</a></li> <li><a href="javascript:;">Windows Vista</a></li> <li><a href="javascript:;">Windows XP</a></li> <li><a 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