麻烦老师帮忙检查下

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一天吃五顿

2022-09-19 22:10:59

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        nav {
            width: 1200px;
            height: 40px;
            margin: 100px auto;
            position: relative;
        }

        nav a {
            float: right;
            height: 40px;
            width: 80px;
            color: #fff;
            border-radius: 5px;
            line-height: 40px;
            text-align: center;
            background-color: #000;
            font-size: 14px;
            text-decoration: none;
        }

        ul {
            list-style: none;
            float: right;
        }

        nav h3 {
            float: left;
            font-weight: 400;
            line-height: 40px;
        }

        nav ul li {
            float: left;
            width: 30px;
            text-align: center;
            font-size: 14px;
            line-height: 40px;
            margin-right: 30px;
            cursor: pointer;
        }

        div {
            position: absolute;
            bottom: 0;
            left: 820px;
            height: 2px;
            width: 30px;
            background-color: #f01400;
            transition: left .3s ease 0s;
        }

        .curren {
            color: #f01400;
        }
    </style>
</head>

<body>
    <nav>
        <h3>慕课手机</h3>
        <a href="javascript:;">立即购买</a>
        <ul>
            <li class="curren">首页</li>
            <li>外观</li>
            <li>配置</li>
            <li>型号</li>
            <li>说明</li>
        </ul>
        <!-- 下划线 -->
        <div></div>
    </nav>
    <script>
        var list = document.querySelector('ul');
        var lis = list.querySelectorAll('li');
        var div = document.querySelector('div');
        list.addEventListener('mouseover', function (e) {
            if (e.target.tagName.toLowerCase() == 'li') {
                for (var i = 0; i < lis.length; i++) {
                    lis[i].className = '';
                }
                e.target.className = 'curren';
                div.style.left = e.target.offsetLeft + 'px';
            }
        })
    </script>
</body>

</html>

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