<!doctype?html>
<html>
<head>
<meta?charset="utf-8">
<title>無標(biāo)題文檔</title>
<script?type="text/ecmascript"?src="js/js2.js"></script>
<link?rel="stylesheet"?href="css/17.css">
</head>
<div?id="ybl">
????<ul>
<li><a?href="#">首頁(yè)</a></li>??
<li><a?href="#">專業(yè)建設(shè)</a>?
<ul>
<li><a?href="#">建設(shè)目標(biāo)</a></li>
?<li><a?href="#">建設(shè)思路</a></li>
?<li><a?href="#">培養(yǎng)方案</a></li>
</ul>
</li>
<li><a?href="#">師資隊(duì)伍</a>
<ul>
<li><a?href="#">?負(fù)責(zé)人</a></li>
<li><a?href="#">隊(duì)伍結(jié)構(gòu)</a></li>
<li><a?href="#">任課教師</a></li>
<li><a?href="#">教學(xué)管理</a></li>
<li><a?href="#">合作辦學(xué)</a></li>
</ul>
</li>
<li><a?href="#">教學(xué)條件</a>
<ul>
<li><a?href="#">經(jīng)費(fèi)投入</a></li>
<li><a?href="#">實(shí)踐教學(xué)</a></li>
<li><a?href="#">教材改革</a></li>
??</ul>
</li>
<li><a?href="#">改革建設(shè)</a>
<ul>
<li><a?href="#">課程改革</a></li>
<li><a?href="#">教材改革</a></li>
</ul>
</div>
<body>
</body>
</html>//?JavaScript?Document
function?windowLoad()??{
var?lis?=?document.getElementById("menu").getElementsByTagName("li");
for?(var?i?=?0;?i?<lis.length;?i++){
lis?[i].onmouseover?=?function()?{
this.className?+=?(this.className.length?>0?"":"")?+"sfhover"
}
?????lis[i].onmouseout?=?function?()
?{
?this.className?=?this.className.replace("sfhover","");
?
?}
???????}
???}
window.onload?=?windowLoad;?//窗口加載成功后執(zhí)行?windoLoad?函數(shù)@charset?"utf-8";
/*?CSS?Document?*/
body
{
font-family:?"宋體";
font-size:?12px;
line-height:?1.5em;
}
#ybl
{?width:500px;
??height:28px;
??margin:0?auto;
??border-bottom:?3px?solid?#e10001;
}??
#ybl?ul
{?
??list-style:none;
??margin:0px;
??padding:0px;
}
#ybl?ul?li
{?
??float:left;?
??margin-left:?1px;
}??
a
{
color:#000;
????text-decoration:?none;
}
a:hover
{
color:?#F00;
}
#ybl?ul?li?a
{?
????display:?block;
width:?87px;
height:?28px;
line-height:?28px;
text-align:?center;
background:?url(../image/26.jpg)?0?0?repeat-x;
font-size:?14px;
}??
#ybl?ul?li?ul
{
??border:?1px?solid?#ccc;
??position:absolute;?
??display:none;
}??
#ybl?ul?li?ul?li
{?
float:none;?
line-height:87px;
background:?#eee;
margin:?0px;
}??
#ybl?ul?li?ul?li?a
{?
background:?none;
}??
#ybl?ul?li?ul?li?a:hover
{?
background-color:#333;
color:?#fff;
}??
#ybl?ul?li:hover?ul
{?
display:block
}
#ybl?ul?li.sfhover?ul
{
display:?block;
}大神幫我看看JS哪里出錯(cuò)了。。Uncaught TypeError: Cannot read property 'getElementsByTagName' of null
關(guān)于下拉菜單HTML+CSS+JavaScript中JS出錯(cuò)在哪我看不懂
qq_那就好_2
2017-06-11 04:08:40
