lovecoding
/
W260426


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .tab-page{
            width: 600px;
            height: 400px;
            border:3px solid #000;
            margin: 100px auto;
        }
        .tab-nav{
            height: 60px;
            background-color: #333;
        }
        .tab-nav .tab-item{
            float: left;
            height: 60px;
            width: 120px;
            text-align: center;
            line-height: 60px;
            color: #fff;
        }
        .tab-nav .tab-item.active{
            background-color: #ddd;
            color: #000;
        }
        .tab-content{
            padding:20px;
        }
        .tab-content .tab-content-item{
            display: none;
        }
        .tab-content .tab-content-item.active{
            display: block;
        }
    </style>
</head>

<body>
    <div class="tab-page">
        <div class="tab-nav">
            <div class="tab-item active">第一节课</div>
            <div class="tab-item">第二节课</div>
            <div class="tab-item">第三节课</div>
        </div>
        <div class="tab-content">
            <div class="tab-content-item active">第一节课的内容</div>
            <div class="tab-content-item">第二节课的内容</div>
            <div class="tab-content-item">第三节课的内容</div>
        </div>
    </div>

    <script>
        // 获取元素
        // tab按钮
        var tabNav = document.querySelectorAll(".tab-item");
        // tab内容
        var tabContent = document.querySelectorAll(".tab-content-item");

        // 绑定事件
        for(var i = 0;i<tabNav.length;i++){
            tabNav[i].index = i
            tabNav[i].onmouseover = function(){
                // 去除所有其他tab按钮的选中状态
                for(var j = 0;j<tabNav.length;j++){
                    tabNav[j].setAttribute("class","tab-item");
                    tabContent[j].setAttribute("class","tab-content-item")
                }
                // console.log(this.index);
                // 切换tab按钮的选中状态
                this.setAttribute("class","tab-item active");
                // 切换content内容的选中状态
                tabContent[this.index].setAttribute("class","tab-content-item active");
            }

        }
    </script>
</body>

</html>