转自：https://www.jb51.net/article/163507.htm
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>www.jb51.net tab切换</title>
<style>
* {
padding: 0;
margin: 0;
}
body {
font-size: 12px;
}
ul,
li,
ol {
list-style: none;
}
a {
text-decoration: none;
}
.clearfix {
clear: both;
overflow: hidden;
}
.tab_title ul li {
float: left;
padding: 0 10px;
}
</style>
</head>
<body>
<div id="Tab1" class="tab clearfix">
<div class="tab_title clearfix">
<ul>
<li>
<a
target="_self"
href="#"
rel="external nofollow"
rel="external nofollow"
rel="external nofollow"
onmouseover="setTab('one',1,3)"
id="one1"
>TAB1</a
>
</li>
<li>
<a
target="_self"
href="#"
rel="external nofollow"
rel="external nofollow"
rel="external nofollow"
onmouseover="setTab('one',2,3)"
id="one2"
>TAB2</a
>
</li>
<li>
<a
target="_self"
href="#"
rel="external nofollow"
rel="external nofollow"
rel="external nofollow"
onmouseover="setTab('one',3,3)"
id="one3"
>TAB3</a
>
</li>
</ul>
</div>
<div class="tab_details clearfix">
<div id="con_one_1" style="display: block">con_one_1</div>
<div style="display: none" id="con_one_2">con_one_2</div>
<div style="display: none" id="con_one_3">con_one_3</div>
</div>
</div>
<script type="text/javascript">
//tab切换效果
function setTab(name, cursel, n) {
for (var i = 1; i <= n; i++) {
var menu = document.getElementById(name + i);
var con = document.getElementById("con_" + name + "_" + i);
menu.className = i == cursel ? "cur" : "";
con.style.display = i == cursel ? "block" : "none";
}
}
</script>
</body>
</html>
GIF