HTML中的代码
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
<link href="CSS.css" rel="stylesheet" />
<script src="JS.js"></script>
</head>
<body>
<ul id="du1">
<li class="cl1"><div class="div1"></div></li>
<li class="cl1"><div class="div1"></div></li>
<li class="cl1"><div class="div1"></div></li>
</ul>
</body>
</html>
CSS中的代码
* {
margin: 0px;
padding: 0px;
}
#du1 {
position: relative;
top: 100px;
left: 100px;
width: 300px;
height: 50px;
background-color: aqua;
}
.cl1 {
position: relative;
margin-top: 10px;
width: 80px;
height: 30px;
background-color: red;
margin-left: 15px;
list-style-type: none;
float: left;
}
.div1 {
position: relative;
margin-top: 32px;
width: 80px;
height: 90px;
background-color: navy;
display: none;
}
JS中的代码
window.onload = function () {
var lis = document.getElementsByClassName("cl1");
for (var i = 0; i < lis.length; i++) {
lis[i].onmouseover = function () {
var div = this.getElementsByClassName("div1");
div[0].style.display = "block";
}
lis[i].onmouseout = function () {
var div = this.getElementsByClassName("div1");
div[0].style.display = "none";
}
}
};
原文：http://www.cnblogs.com/123lucy/p/5638733.html