JS案例--Tab栏切换

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

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>

    <style>
        * {
            margin: 0;
            padding: 0;
        }

        ul,
        ol,
        li {
            list-style: none;
        }

        .container {
            width: 600px;
            height: 400px;
            border: 10px solid #333;
            margin: 30px auto;
            display: flex;
            flex-direction: column;
        }

        .container>ul {
            width: 100%;
            height: 40px;
            display: flex;
        }

        .container>ul>li {
            flex: 1;
            display: flex;
            justify-content: center;
            align-items: center;
            font-size: 30px;
            color: #fff;
            background-color: hotpink;
        }

        .container>ul>li.active {
            background-color: orange;
        }

        .container>ol {
            flex: 1;
            position: relative;
        }

        .container>ol>li {
            width: 100%;
            height: 100%;
            position: absolute;
            top: 0;
            left: 0;

            background-color: skyblue;

            color: #fff;
            font-size: 100px;
            display: flex;
            justify-content: center;
            align-items: center;

            display: none;
        }

        .container>ol>li.active {
            display: flex;
        }
    </style>
</head>

<body>

    <div class="container">
        <ul>
            <li class="active">1</li>
            <li id="1">2</li>
            <li id="1">3</li>
        </ul>
        <ol>
            <li class="active">1</li>
            <li>2</li>
            <li>3</li>
        </ol>
    </div>


    <script>

        function Tab(lab){
            // 获取页面元素
            this.ulLiObj = lab.querySelectorAll('ul > li');
            this.olLiObj = lab.querySelectorAll('ol > li');
        }

        Tab.prototype.tab =   function () {
            // 常量定义，用户无法修改
            const _this = this;
            // ulli添加点击事件
            this.ulLiObj.forEach((item, index) => {
                item.addEventListener('click', () => {
                    // 去除其他liclass属性
                    _this.ulLiObj.forEach((ele, index) => {
                        ele.removeAttribute('class');
                        // 去除对应olli的class
                        _this.olLiObj[index].removeAttribute('class');
                    })
                    // 给自己添加class
                    item.setAttribute('class', 'active');
                    // 给对应olli添加class
                    _this.olLiObj[index].setAttribute('class', 'active')
                })
            })
        }

        let divObj = document.querySelector('.container');
        let tab1 = new Tab(divObj);
        tab1.tab();


    </script>
</body>

</html>
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原文地址：https://www.cnblogs.com/CGWTQ/p/11675470.html