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小英雄哪托

2022-05-17 17:44:53

<!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>
        header {
            background-color: #ccc;
            overflow: hidden;
            padding-top: 12px;
            padding-right: 12px;
            box-sizing: border-box;
        }
        header button {
            color: #fff;
            background-color: #000;
            width: 80px;
            height: 40px;
            float: right;
            margin-left: 20px;
        }
        header ul {
            float: right;
            list-style: none;
            box-sizing: border-box;
            position: relative;
        }
        header ul li {
            float: left;
            margin-right: 30px;
            cursor: pointer;
        }
        header ul li.current {
            color: red;
        }
        header ul .box {
            width: 34px;
            height: 2px;
            background-color: red;
            position: absolute;
            left: 39px;
            bottom: -7px;
        }
    </style>
</head>
<body>
    <header>
        <button>立即购买</button>
        <ul id="nav">
            <li class="current">首页</li>
            <li>外观</li>
            <li>配置</li>
            <li>说明</li>
            <li>型号</li>
            <div class="box" id="box"></div>
        </ul>
    </header>

    <script>
        var nav = document.getElementById('nav');
        var box = document.getElementById('box');
        var lis = document.querySelectorAll('li');

        var idx = 1;
        nav.onmouseover = function (e) {
           
            if (e.target.tagName.toLowerCase() == 'li') {
                for (var i = 0; i < lis.length; i++) {
                    if (lis[i] === e.target) {
                        lis[i].className = 'current';
                        box.style.left = 39 + i * 62 + 'px';
                    } else {
                        lis[i].className = 'none';
                    }
                }    
            }
        }

    </script>
</body>
</html>

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