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+<!DOCTYPE html>
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+<html lang="en">
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+ <style>
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+ *{
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+ margin: 0;
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+ padding: 0;
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+ }
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+ li{
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+ list-style: none;
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+ }
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+ .box{
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+ width: 500px;
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+ height: 300px;
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+ border:3px solid black;
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+ margin: 100px auto;
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+ }
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+ .tab-nav{
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+ height: 50px;
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+ background-color: black;
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+ }
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+ .tab-nav .nav-btn{
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+ color: #fff;
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+ float: left;
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+ width: 100px;
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+ text-align: center;
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+ line-height: 50px;
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+ }
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+ .tab-nav .active{
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+ background-color: #999;
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+ color: #111;
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+ }
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+ .tab-content .content-item{
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+ display: none;
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+ padding: 20px;
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+ }
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+ .tab-content .active{
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+ display: block;
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+ }
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+ </style>
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+</head>
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+<body>
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+ <div class="box">
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+ <div class="tab-nav">
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+ <ul>
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+ <li class="nav-btn active">第一节课</li>
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+ <li class="nav-btn">第二节课</li>
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+ <li class="nav-btn">第三节课</li>
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+ </ul>
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+ </div>
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+ <div class="tab-content">
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+ <div class="content-item active">第一节课内容</div>
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+ <div class="content-item">第二节课内容</div>
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+ <div class="content-item">第三节课内容</div>
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+ </div>
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+ </div>
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+ <script>
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+ // 获取所有的按钮
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+ var aNavBtns = document.getElementsByClassName("nav-btn");
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+ // 获取所有的内容
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+ var aContentItems = document.getElementsByClassName("content-item");
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+
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+ for(var i=0;i<aNavBtns.length;i++){
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+ // 循环过程中为每一个按钮添加一个索引值
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+ aNavBtns[i].index = i;
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+ // 循环所有按钮 绑定点击事件
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+ aNavBtns[i].onmouseover = function(){
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+ // 清除所有按钮的active类名
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+ for(var j=0;j<aNavBtns.length;j++){
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+ aNavBtns[j].classList.remove("active");
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+ aContentItems[j].classList.remove("active");
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+ }
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+ // 给当前点击的按钮添加active类名
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+ this.classList.add("active");
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+
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+ // 给对应内容添加active类名 让其显示
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+ aContentItems[this.index].classList.add("active");
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+ // console.log(this.index)
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+ }
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+ }
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+ </script>
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+</body>
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+</html>
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