javascript 下拉菜单的不同写法
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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style type="text/css">
*{ margin:0px; padding:0px;}
body{ font-family:Verdana, Geneva, sans-serif; font-size:14px;}
.nav{ width:600px; height:40px; background-color:#eee; margin:0 auto; margin-top:150px;}
ul{ list-style:none;}
ul li{ float:left; line-height:40px; text-align:center; width:100px;}
a{ text-decoration:none; color:#000; display:block;}
a:hover{ color:#F00; background-color:#666;}
ul li ul li{ float:none;background-color:#eee; margin:2px 0px;}
ul li ul{display:none;}
ul li ul a:hover{background-color:#c00;color:#fff;}
</style>
<script type="text/javascript">
/*
function ShowSub(li) {
var subMenu = li.getElementsByTagName("ul")[0];
subMenu.style.display = "block";
}
function HideSub(li) {
var subMenu = li.getElementsByTagName("ul")[0];
subMenu.style.display = "none";
}*/
window.onload=function(){
var sub = getClass("subnav");
//alert(sub[0].innerHTML);
for(var i=0,len=sub.length; i<len; i++){
addEvent(sub[i],"mouseover",function(){
var ul = this.getElementsByTagName("ul")[0];
ul.style.display="block";
});
addEvent(sub[i],"mouseout",function(){
var ul = this.getElementsByTagName("ul")[0];
ul.style.display="none";
});
}
}
//获取class集
function getClass(cls,obj) {
var obj = obj?obj:document;
if(document.getElementsByClassName){
return obj.getElementsByClassName(cls);
}else{
var all = obj.getElementsByTagName("*"),
result = [];
for(var i=0,len=all.length; i<len; i++){
if(all[i].className === cls){
result.push(all[i]);
}
}
return result;
}
}
//添加事件
function addEvent(o,type,fn) {
if(o.addEventLister){
o.addEventLister(type,fn,false);//false不冒泡
}else if(o.attachEvent){
o.attachEvent("on"+type,fn);
}else{
o["on"+type]=fn;
}
}
</script></head>
<body>
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<ul>
<li><a href="#">首页</a></li>
<li class="subnav"><a href="#">课程大厅</a>
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<li><a href="#">JavaScript</a></li>
<li><a href="#">Html/CSS</a></li>
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</li>
<li class="subnav"><a href="#">学习中心</a>
<ul>
<li><a href="#">视频学习</a></li>
<li><a href="#">实例练习</a></li>
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