代码最少的选项卡，选中修改样式，切换到当前的界面。
偶实现的功能：
<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<title></title>
<link rel="stylesheet" href="base.css" />
<script type="text/javascript" src="jquery-1.10.1.min.js" ></script>
</head>
<body>
<style>
.t-tabs{ width: 240px; margin: 20px auto 0 auto;}
.t-tabs>ul{ height: 30px;}
.t-tabs>ul>li{ width: 80px; text-align: center; line-height: 2; height: 30px; float: left;}
.t-tabs>ul>.hover{ font-weight: bold;}
.t-tabs>ul>li>a{ color: #fff;}
.m-tabs-cont>div{ width: 240px; height: 80px; display: none;}
.m-tabs-cont>.current{ display: block;}
.m-tabs-cont>div>p{ color: #fff; text-align: center; padding-top: 20px;}
.t-tabs>ul>li:nth-child(1), .m-tabs-cont>div:nth-child(1){ background-color: #06f;}
.t-tabs>ul>li:nth-child(2), .m-tabs-cont>div:nth-child(2){ background-color: #f60;}
.t-tabs>ul>li:nth-child(3), .m-tabs-cont>div:nth-child(3){ background-color: #c00;}
</style>
<div class="t-tabs" id="tabs">
<ul>
<li class="hover"><a href="###">111</a></li>
<li><a href="###">222</a></li>
<li><a href="###">333</a></li>
</ul>
<div class="m-tabs-cont" id="tabscont">
<div class="current"><p>cont111</p></div>
<div><p>cont222</p></div>
<div><p>cont333</p></div>
</div>
</div>
<script>
$(function() {
tabs();
});
function tabs(){
$('#tabs ul li').mouseover(function(){
$('#tabs ul li').eq($(this).index()).addClass('hover').siblings().removeClass('hover');
$('#tabscont div').eq($(this).index()).addClass('current').siblings().removeClass('current');
});
}
</script>
</body>
</html>
效果图：
结果群友（贾顺名）提出一个纯CSS的解决方法
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0;" name="viewport" />
<title>纯CSS实现tab选项卡切换</title>
<style media="screen">
* {
box-sizing: border-box;
}
body {
margin: 0;
background-color: #2DB7F5;
color: #08172F;
position: absolute;
height: 100%;
width: 100%;
overflow: hidden;
}
input[name='toggle'] {
display: none;
}
nav {
margin-top: 20px;
}
nav ul {
position: relative;
padding: 0;
margin: 0;
list-style: none;
font-size: 0;
}
nav ul {
height: 40px;
line-height: 40px;
text-align: center;
}
nav ul li {
display: inline-block;
width: 33.33%;
height: 100%;
font-size: 14px;
}
nav ul li label {
display: inline-block;
width: 100%;
height: 100%;
border-top-left-radius: 10px;
border-top-right-radius: 10px;
background-color: #1F5AA3;
color: #fff;
}
main {
position: absolute;
height: 200px;
width: 100%;
background: white;
color: #1F5AA3;
padding: 10px
}
.container {
display: none;
}
#tab1:checked~nav label[for='tab1'] {
background-color: #fff;
color: #1F5AA3;
}
#tab1:checked~main .tab1-container {
display: block;
}
#tab2:checked~nav label[for='tab2'] {
background-color: #fff;
color: #1F5AA3;
}
#tab2:checked~main .tab2-container {
display: block;
}
#tab3:checked~nav label[for='tab3'] {
background-color: #fff;
color: #1F5AA3;
}
#tab3:checked~main .tab3-container {
display: block;
}
</style>
</head>
<body>
<input type="radio" name="toggle" id="tab1" checked/>
<input type="radio" name="toggle" id="tab2" />
<input type="radio" name="toggle" id="tab3" />
<nav>
<ul>
<li><label for="tab1">tab1</label></li>
<li><label for="tab2">tab2</label></li>
<li><label for="tab3">tab3</label></li>
</ul>
</nav>
<main>
<section class="container tab1-container">
<p>这里是第一个tab页的内容</p>
</section>
<section class="container tab2-container">
<p>这里是第二个tab页的内容</p>
</section>
<section class="container tab3-container">
<p>这里是第三个tab页的内容</p>
</section>
</main>
</body>
</html>
效果图：