html中 导航条置顶的代码6 JS+CSS实现六级网站导航主菜单效果

本文实例讲述了JS+CSS实现六级网站导航主菜单效果。分享给大家供大家参考。具体如下：

这是一款JS+CSS实现支持6级的网站导航主菜单，级级相信够大家用了，外观蓝色风格，也是使用最多的一种菜单颜色，而且菜单的兼容性非常好，支持IE6\IE7\IE8，火狐、GG浏览器等不同内核的主流浏览器。

运行效果截图如下：

在线演示地址如下：

具体代码如下：

/p>

"/TR/xhtml2/DTD/xhtml1-strict.dtd">

CSS六级导航菜单

.preload1 {background: url(images/blank_over.gif);}

.preload2 {background: url(images/blank_overa.gif);}

#nav {padding:0; margin:0; list-style:none; height:36px; background:#fff; position:relative; z-index:500; font-family:arial, verdana, sans-serif;}

#nav li.top {display:block; float:left;}

#nav li a.top_link {display:block; float:left; height:36px; line-height:27px; color:#ccc; text-decoration:none; font-size:11px; font-weight:bold; padding:0 0 0 12px; cursor:pointer;background: url(images/blank.gif);}

#nav li a.top_link span {float:left; display:block; padding:0 24px 0 12px; height:36px;background:url(images/blank.gif) right top;}

#nav li a.top_link span.down {float:left; display:block; padding:0 24px 0 12px; height:36px; background:url(images/blanka.gif) no-repeat right top;}

#nav li a.top_link:hover {color:#fff; background: url(images/blank_over.gif) no-repeat;}

#nav li a.top_link:hover span {background:url(images/blank_over.gif) no-repeat right top;}

#nav li a.top_link:hover span.down {background:url(images/blank_overa.gif) no-repeat right top;}

#nav li:hover > a.top_link {color:#fff; background: url(images/blank_over.gif) no-repeat;}

#nav li:hover > a.top_link span {background:url(images/blank_over.gif) no-repeat right top;}

#nav li:hover > a.top_link span.down {background:url(images/blank_overa.gif) no-repeat right top;}

#nav li:hover {position:relative; z-index:200;}

#nav ul,

#nav li:hover ul ul,

#nav li:hover ul li:hover ul ul,

#nav li:hover ul li:hover ul li:hover ul ul,

#nav li:hover ul li:hover ul li:hover ul li:hover ul ul

{position:absolute; left:-9999px; top:-9999px; width:0; height:0; margin:0; padding:0; list-style:none;}

#nav li:hover ul.sub

{left:0; top:31px; background: #fff; padding:3px; border:1px solid #3a93d2; white-space:nowrap; width:90px; height:auto; z-index:300;}

#nav li:hover ul.sub li

{display:block; height:20px; position:relative; float:left; width:90px; font-weight:normal;}

#nav li:hover ul.sub li a

{display:block; font-size:11px; height:20px; width:90px; line-height:20px; text-indent:5px; color:#000; text-decoration:none;}

#nav li ul.sub li a.fly{background:#fff url(images/arrow.gif) 80px 7px no-repeat;}

#nav li:hover ul.sub li a:hover {background:#3a93d2; color:#fff;}

#nav li:hover ul.sub li a.fly:hover{background:#3a93d2 url(images/arrow_over.gif) 80px 7px no-repeat; color:#fff;}

#nav li:hover ul li:hover > a.fly {background:#3a93d2 url(images/arrow_over.gif) 80px 7px no-repeat; color:#fff;}

#nav li:hover ul li:hover ul,

#nav li:hover ul li:hover ul li:hover ul,

#nav li:hover ul li:hover ul li:hover ul li:hover ul,

#nav li:hover ul li:hover ul li:hover ul li:hover ul li:hover ul

{left:90px; top:-4px; background: #fff; padding:3px; border:1px solid #3a93d2; white-space:nowrap; width:90px; z-index:400; height:auto;}

stuHover = function() {

var cssRule;

var newSelector;

for (var i = 0; i < document.styleSheets.length; i++)

for (var x = 0; x < document.styleSheets[i].rules.length ; x++)

{

cssRule = document.styleSheets[i].rules[x];

if (cssRule.selectorText.indexOf("LI:hover") != -1)

{

newSelector = cssRule.selectorText.replace(/LI:hover/gi, "LI.iehover");

document.styleSheets[i].addRule(newSelector , cssRule.style.cssText);

}

}

var getElm = document.getElementById("nav").getElementsByTagName("LI");

for (var i=0; i

getElm[i].οnmοuseοver=function() {

this.className+=" iehover";

}

getElm[i].οnmοuseοut=function() {

this.className=this.className.replace(new RegExp(" iehover\\b"), "");

}

}

}

if (window.attachEvent) window.attachEvent("onload", stuHover);

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希望本文所述对大家的JavaScript程序设计有所帮助。