作业检查

来源：2-8 项目作业

以你为瘾丶

2021-09-13 10:56:27

相关代码：

<!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;
        }

        .center-wrap {
            width: 1152px;
            margin: 0 auto;
        }

        .header-top {
            height: 40px;
            overflow: hidden;
        }

        .header-top .logo {
            float: left;
        }

        .header-top .header-nav {
            float: left;
            line-height: 40px;
            position: absolute;
            right: 307px;
        }

        .header-top .header-nav ul {
            list-style: none;
            position: relative;
        }

        .header-top .header-nav ul li {
            float: left;
            margin-right: 45px;
            cursor: pointer;
        }

        .header-top .header-nav ul li:hover {
            color: #f01400;
        }

        .header-top .header-nav ul li:last-child {
            margin-right: 0;
        }

        .header-top .header-nav .line {
            width: 32px;
            height: 3px;
            background-color: #f01400;
            position: absolute;
            left: 0px;
            bottom: 0;
            transition: left .5s ease 0s;
        }

        .header-top .btn {
            float: right;
            line-height: 40px;
            background-color: black;
            width: 80px;
            text-align: center;
        }

        .header-top .btn a {
            text-decoration: none;
            color: white;
            display: block;
            width: 80px;
            height: 40px;
        }
    </style>

</head>

<body>
    <header class="header-top">
        <div class="center-wrap">
            <div class="logo">
                <h1>慕课手机</h1>
            </div>
            <div class="header-nav">
                <ul id="ul">
                    <li data-n="0">首页</li>
                    <li data-n="1">外观</li>
                    <li data-n="2">配置</li>
                    <li data-n="3">型号</li>
                    <li data-n="4">说明</li>
                </ul>
                <div class="line" id="line"></div>
            </div>
            <div class="btn">
                <a href="">立即购买</a>
            </div>
        </div>
    </header>

    <script>
        var oUl = document.getElementById("ul")
        var oLine = document.getElementById("line")
        var list=document.getElementsByTagName("li")
        oUl.onmouseover = function (e) {
            if (e.target.tagName.toLowerCase() == "li") {
                n = e.target.getAttribute("data-n")
                oLine.style.left=n*77+"px"
            }
        }
    </script>
</body>

</html>