CSS3实现错综复杂导航菜单特效代码

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以下是 CSS3实现错综复杂导航菜单特效代码的示例演示效果:

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部分效果截图:

HTML代码(index.html):


<!doctype html>
<html>
<head>
    <title>CSS3实现错综复杂导航菜单</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <script src="js/prefixfree.min.js"></script>
    <style>
        /* Clearing floats */
        .cf:before,
        .cf:after {
            content: " ";
            display: table;
        }

        .cf:after {clear:both; }

        .cf {*zoom: 1; }

        /* Mini reset, no margins, paddings or bullets */
        .menu,
        .submenu {
            margin: 0;
            padding: 0;
            list-style: none;
        }

        /* Main level */
        .menu {
            margin: 50px auto;
            width: 800px;
            width: -moz-fit-content;
            width: -webkit-fit-content;
            width: fit-content;
        }

        .menu > li {
            background: #34495e;
            float: left;
            position: relative;
            transform: skewX(25deg);
        }

        .menu a {
            display: block;
            color: #fff;
            text-transform: uppercase;
            text-decoration: none;
            font-family: Arial, Helvetica;
            font-size: 14px;
        }

        .menu li:hover {
            background: #e74c3c;
        }

        .menu > li > a {
            transform: skewX(-25deg);
            padding: 1em 2em;
        }

        /* Dropdown */
        .submenu {
            position: absolute;
            width: 200px;
            left: 50%;
            margin-left: -100px;
            transform: skewX(-25deg);
            transform-origin: left top;
        }

        .submenu li {
            background-color: #34495e;
            position: relative;
            overflow: hidden;
        }

        .submenu > li > a {
            padding: 1em 2em;
        }

        .submenu > li::after {
            content: '';
            position: absolute;
            top: -125%;
            height: 100%;
            width: 100%;
            box-shadow: 0 0 50px rgba(0, 0, 0, .9);
        }

        /* Odd stuff */
        .submenu > li:nth-child(odd) {
            transform: skewX(-25deg) translateX(0);
        }

        .submenu > li:nth-child(odd) > a {
            transform: skewX(25deg);
        }

        .submenu > li:nth-child(odd)::after {
            right: -50%;
            transform: skewX(-25deg) rotate(3deg);
        }

        /* Even stuff */
        .submenu > li:nth-child(even) {
            transform: skewX(25deg) translateX(0);
        }

        .submenu > li:nth-child(even) > a {
            transform: skewX(-25deg);
        }

        .submenu > li:nth-child(even)::after {
            left: -50%;
            transform: skewX(25deg) rotate(3deg);
        }

        /* Show dropdown */
        .submenu,
        .submenu li {
            opacity: 0;
            visibility: hidden;
        }

        .submenu li {
            transition: .2s ease transform;
        }

        .menu > li:hover .submenu,
        .menu > li:hover .submenu li {
            opacity: 1;
            visibility: visible;
        }

        .menu > li:hover .submenu li:nth-child(even) {
            transform: skewX(25deg) translateX(15px);
        }

        .menu > li:hover .submenu li:nth-child(odd) {
            transform: skewX(-25deg) translateX(-15px);
        }

        /* Demo only */
        #about {
            margin: 50px 0 0 0;
            color: #444;
            font-family: Arial, Helvetica;
            text-align: center;
        }

        #about a {
            color: #777;
        }
    </style>
</head>
<body>
    <ul class="menu cf">
        <li><a href="">Menu item</a></li>
        <li>
            <a href="">Menu item</a>
            <ul class="submenu">
                <li><a href="">Submenu item</a></li>
                <li><a href="">Submenu item</a></li>
                <li><a href="">Submenu item</a></li>
                <li><a href="">Submenu item</a></li>
            </ul>
        </li>
        <li><a href="">Menu item</a></li>
        <li><a href="">Menu item</a></li>
        <li><a href="">Menu item</a></li>
    </ul>
</body>
</html>

JS代码(prefixfree.min.js):

/** * StyleFix 1.0.3 & PrefixFree 1.0.7 * @author Lea Verou * MIT license */
(function(){
	function t(e,t){
	return[].slice.call((t||document).querySelectorAll(e))}
if(!window.addEventListener)return;
	var e=window.StyleFix={
	link:function(t){
	try{
	if(t.rel!=="stylesheet"||t.hasAttribute("data-noprefix"))return}
catch(n){
	return}
var r=t.href||t.getAttribute("data-href"),i=r.replace(/[^\/]+$/,""),s=t.parentNode,o=new XMLHttpRequest,u;
	o.onreadystatechange=function(){
	o.readyState===4&&u()}
;
	u=function(){
	var n=o.responseText;
	if(n&&t.parentNode&&(!o.status||o.status<400||o.status>600)){
	n=e.fix(n,!0,t);
	if(i){
	n=n.replace(/url\(\s*?((?:"|')?)(.+?)\1\s*?\)/gi,function(e,t,n){
	return/^([a-z]{
	3,10}
:|\/|#)/i.test(n)?e:'url("'+i+n+'")'}
);
	var r=i.replace(/([\\\^\$*+[\]?{
}
.=!:(|)])/g,"\\$1");
	n=n.replace(RegExp("\\b(behavior:\\s*?url\\('?\"?)"+r,"gi"),"$1")}
var u=document.createElement("style");
	u.textContent=n;
	u.media=t.media;
	u.disabled=t.disabled;
	u.setAttribute("data-href",t.getAttribute("href"));
	s.insertBefore(u,t);
	s.removeChild(t);
	u.media=t.media}
}
;
	try{
	o.open("GET",r);
	o.send(null)}
catch(n){
	if(typeof XDomainRequest!="undefined"){
	o=new XDomainRequest;
	o.onerror=o.onprogress=function(){
}
;
	o.onload=u;
	o.open("GET",r);
	o.send(null)}
}
t.setAttribute("data-inprogress","")}
,styleElement:function(t){
	if(t.hasAttribute("data-noprefix"))return;
	var n=t.disabled;
	t.textContent=e.fix(t.textContent,!0,t);
	t.disabled=n}
,styleAttribute:function(t){
	var n=t.getAttribute("style");
	n=e.fix(n,!1,t);
	t.setAttribute("style",n)}
,process:function(){
	t('link[rel="stylesheet"]:not([data-inprogress])').forEach(StyleFix.link);
	t("style").forEach(StyleFix.styleElement);
	t("[style]").forEach(StyleFix.styleAttribute)}
,register:function(t,n){
	(e.fixers=e.fixers||[]).splice(n===undefined?e.fixers.length:n,0,t)}
,fix:function(t,n,r){
	for(var i=0;
	i<e.fixers.length;
	i++)t=e.fixers[i](t,n,r)||t;
	return t}
,camelCase:function(e){
	return e.replace(/-([a-z])/g,function(e,t){
	return t.toUpperCase()}
).replace("-","")}
,deCamelCase:function(e){
	return e.replace(/[A-Z]/g,function(e){
	return"-"+e.toLowerCase()}
)}
}
;
	(function(){
	setTimeout(function(){
	t('link[rel="stylesheet"]').forEach(StyleFix.link)}
,10);
	document.addEventListener("DOMContentLoaded",StyleFix.process,!1)}
)()}
)();
	(function(e){
	function t(e,t,r,i,s){
	e=n[e];
	if(e.length){
	var o=RegExp(t+"("+e.join("|")+")"+r,"gi");
	s=s.replace(o,i)}
return s}
if(!window.StyleFix||!window.getComputedStyle)return;
	var n=window.PrefixFree={
	prefixCSS:function(e,r,i){
	var s=n.prefix;
	n.functions.indexOf("linear-gradient")>-1&&(e=e.replace(/(\s|:|,)(repeating-)?linear-gradient\(\s*(-?\d*\.?\d*)deg/ig,function(e,t,n,r){
	return t+(n||"")+"linear-gradient("+(90-r)+"deg"}
));
	e=t("functions","(\\s|:|,)","\\s*\\(","$1"+s+"$2(",e);
	e=t("keywords","(\\s|:)","(\\s|;
	|\\}
|$)","$1"+s+"$2$3",e);
	e=t("properties","(^|\\{
	|\\s|;
	)","\\s*:","$1"+s+"$2:",e);
	if(n.properties.length){
	var o=RegExp("\\b("+n.properties.join("|")+")(?!:)","gi");
	e=t("valueProperties","\\b",":(.+?);
	",function(e){
	return e.replace(o,s+"$1")}
,e)}
if(r){
	e=t("selectors","","\\b",n.prefixSelector,e);
	e=t("atrules","@","\\b","@"+s+"$1",e)}
e=e.replace(RegExp("-"+s,"g"),"-");
	e=e.replace(/-\*-(?=[a-z]+)/gi,n.prefix);
	return e}
,property:function(e){
	return(n.properties.indexOf(e)?n.prefix:"")+e}
,value:function(e,r){
	e=t("functions","(^|\\s|,)","\\s*\\(","$1"+n.prefix+"$2(",e);
	e=t("keywords","(^|\\s)","(\\s|$)","$1"+n.prefix+"$2$3",e);
	return e}
,prefixSelector:function(e){
	return e.replace(/^:{
	1,2}
/,function(e){
	return e+n.prefix}
)}
,prefixProperty:function(e,t){
	var r=n.prefix+e;
	return t?StyleFix.camelCase(r):r}
}
;
	(function(){
	var e={
}
,t=[],r={
}
,i=getComputedStyle(document.documentElement,null),s=document.createElement("div").style,o=function(n){
	if(n.charAt(0)==="-"){
	t.push(n);
	var r=n.split("-"),i=r[1];
	e[i]=++e[i]||1;
	while(r.length>3){
	r.pop();
	var s=r.join("-");
	u(s)&&t.indexOf(s)===-1&&t.push(s)}
}
}
,u=function(e){
	return StyleFix.camelCase(e)in s}
;
	if(i.length>0)for(var a=0;
	a<i.length;
	a++)o(i[a]);
	else for(var f in i)o(StyleFix.deCamelCase(f));
	var l={
	uses:0}
;
	for(var c in e){
	var h=e[c];
	l.uses<h&&(l={
	prefix:c,uses:h}
)}
n.prefix="-"+l.prefix+"-";
	n.Prefix=StyleFix.camelCase(n.prefix);
	n.properties=[];
	for(var a=0;
	a<t.length;
	a++){
	var f=t[a];
	if(f.indexOf(n.prefix)===0){
	var p=f.slice(n.prefix.length);
	u(p)||n.properties.push(p)}
}
n.Prefix=="Ms"&&!("transform"in s)&&!("MsTransform"in s)&&"msTransform"in s&&n.properties.push("transform","transform-origin");
	n.properties.sort()}
)();
	(function(){
	function i(e,t){
	r[t]="";
	r[t]=e;
	return!!r[t]}
var e={
	"linear-gradient":{
	property:"backgroundImage",params:"red,teal"}
,calc:{
	property:"width",params:"1px + 5%"}
,element:{
	property:"backgroundImage",params:"#foo"}
,"cross-fade":{
	property:"backgroundImage",params:"url(a.png),url(b.png),50%"}
}
;
	e["repeating-linear-gradient"]=e["repeating-radial-gradient"]=e["radial-gradient"]=e["linear-gradient"];
	var t={
	initial:"color","zoom-in":"cursor","zoom-out":"cursor",box:"display",flexbox:"display","inline-flexbox":"display",flex:"display","inline-flex":"display"}
;
	n.functions=[];
	n.keywords=[];
	var r=document.createElement("div").style;
	for(var s in e){
	var o=e[s],u=o.property,a=s+"("+o.params+")";
	!i(a,u)&&i(n.prefix+a,u)&&n.functions.push(s)}
for(var f in t){
	var u=t[f];
	!i(f,u)&&i(n.prefix+f,u)&&n.keywords.push(f)}
}
)();
	(function(){
	function s(e){
	i.textContent=e+"{
}
";
	return!!i.sheet.cssRules.length}
var t={
	":read-only":null,":read-write":null,":any-link":null,"::selection":null}
,r={
	keyframes:"name",viewport:null,document:'regexp(".")'}
;
	n.selectors=[];
	n.atrules=[];
	var i=e.appendChild(document.createElement("style"));
	for(var o in t){
	var u=o+(t[o]?"("+t[o]+")":"");
	!s(u)&&s(n.prefixSelector(u))&&n.selectors.push(o)}
for(var a in r){
	var u=a+" "+(r[a]||"");
	!s("@"+u)&&s("@"+n.prefix+u)&&n.atrules.push(a)}
e.removeChild(i)}
)();
	n.valueProperties=["transition","transition-property"];
	e.className+=" "+n.prefix;
	StyleFix.register(n.prefixCSS)}
)(document.documentElement);

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