<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>定位</title>
<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
li {
list-style-type: none;
}
a {
text-decoration: none;
color: rgb(82, 79, 79);
}
.nav {
height: 50px;
border: 1px solid #ccc;
margin-top: 5px;
}
.nav li {
/* height: 48px; */
float: left;
width: 20%;
border-right: 1px solid #ccc;
}
.nav li a {
display: block;
height: 48px;
text-align: center;
line-height: 48px;
position: relative;
}
.nav li a .code {
position: absolute;
/* 从水平距离一半的位置开始，图片水平并不是居中显示 */
left: 50%;
/* 垂直距离 距离顶部50px */
top: 50px;
/* 图片水平位置居中显示，减掉图片一半的宽度 */
transform: translate(-50%);
display: none;
}
</style>
</head>
<body>
<script>
function over() {
var code = document.getElementsByClassName("code");
var len = code.length;
code[len - 1].style.display = "block";
}
function out() {
var code = document.getElementsByClassName("code");
code[0].style.display = "none"
}
</script>
<div class="nav">
<ul>
<li onm ouseover="over()" onm ouseout="out()">
<a href="#">
导航显示
<img src="./html+css/study/code.png" alt="" class="code">
</a>
</li>
<li><a href="#">导航显示</a></li>
<li><a href="#">导航显示</a></li>
<li><a href="#">导航显示</a></li>
<li><a href="#">导航显示</a></li>
</ul>
</div>
</body>
</html>
标签：定位,none,code,li,nav,height,display,css From： https://www.cnblogs.com/qutao125/p/16754433.html