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@@ -0,0 +1,107 @@
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+<!DOCTYPE html>
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+<html lang="en">
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+
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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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+ body,ul{
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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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+ .clearfix::after{
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+ content: "";
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+ display: block;
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+ clear: both;
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+ }
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+ .box{
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+ width: 600px;
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+ height: 300px;
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+ border:1px solid black;
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+ margin: 100px auto;
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+ }
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+ .nav-content{
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+ height: 50px;
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+ background-color: black;
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+ }
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+ .nav-content li{
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+ float: left;
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+ color: #fff;
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+ padding: 0 20px;
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+ height: 50px;
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+ line-height: 50px;
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+ cursor: pointer;
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+ }
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+ .nav-content .active{
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+ background-color: #aaa;
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+ color: black;
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+ }
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+ .info-content{
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+ padding: 20px;
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+ }
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+ .info-content > div{
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+ display: none;
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+ }
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+ .info-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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+
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+<body>
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+ <div class="box">
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+ <div class="nav-content">
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+ <ul class="clearfix">
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+ <li class="active">第一节课</li>
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+ <li >第二节课</li>
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+ <li>第三节课</li>
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+ </ul>
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+ </div>
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+ <div class="info-content">
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+ <div class="active">
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+ 第一节课内容
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+ 第一节课内容
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+ 第一节课内容
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+ 第一节课内容
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+ </div>
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+ <div class="">
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+ 第二节课内容
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+ 第二节课内容
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+ 第二节课内容
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+ 第二节课内容
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+ </div>
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+ <div class="">
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+ 第三节课内容
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+ 第三节课内容
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+ 第三节课内容
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+ 第三节课内容
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+ </div>
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+ </div>
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+ </div>
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+ <script>
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+ var liBtn = document.getElementsByTagName("li");
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+ var contentArr = document.getElementsByClassName("info-content")[0].getElementsByTagName("div");
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+ console.log(contentArr)
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+ // 循环绑定鼠标移入事件
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+ for(var i=0;i<liBtn.length;i++){
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+ // 创建新属性保持索引值
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+ liBtn[i].index = i;
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+ liBtn[i].onmouseenter = function(){
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+ // 循环清除所有标签按钮的选中状态
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+ for(var j=0;j<liBtn.length;j++){
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+ liBtn[j].setAttribute("class","");
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+ contentArr[j].setAttribute("class","");
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+ }
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+ // 仅给当前按钮加入选中状态
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+ this.setAttribute("class","active");
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+ contentArr[this.index].setAttribute("class","active");
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+ }
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+ }
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+ </script>
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+</body>
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+
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+</html>
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