运用html相关知识编写导航栏和二级菜单

相关代码：

<!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>
        * {
            margin: 0;
            padding: 0;
            list-style: none;
        }

        #left {
            width: 200px;
        }

        #left ul {
            width: 200px;
            background: rgba(105, 101, 101, .6);
            color: #fff;

        }

        #left ul li {
            width: 200px;
            height: 50px;
            font-size: 20px;
            border: 1px solid #666;
            line-height: 50px;



        }

        #left ul li:hover {
            background-color: #ff6700;

        }

        .right {
            max-width: 1200px;
            overflow: hidden;
            min-width: 300px;
            height: 550px;
            position: absolute;
            top: 0px;
            left: 230px;
            display: none;
            background-color: #fff;



        }

        .right ul {
            height: 550px;
            display: none;
            flex-direction: column;
            flex-wrap: wrap;

        }

        .right ul li {
            width: 200px;
            margin-right: 10px;
            height: 110px;

        }

        .right ul li:hover {
            color: #ff6700;
        }
    </style>
</head>

<body>
    <div id="left">
        <ul></ul>
    </div>
    <div class="right">
        <ul class="submenu">

        </ul>
    </div>
    <script src="./js/14xiaomi.js"></script>
    <script src="./js/jquery.js"></script>
    <script>
        // 将数组遍历出来，然后放到左侧盒子里面
        var str1 = '';
        $(menu).each(function (index, item) {
            str1 += `<li>${item}</li>`
        })
        $('#left ul').html(str1);

        // 右边盒子
        var str2 = '';
        $(data).each(function (index2, item2) {
            var str3 = '';
            $(item2.list).each(function (index3, item3) {
                str3 += `
                <li>
            <img src="${item3.url}" alt="">
            <p>${item3.title}</p>
            </li>
                `
            })


            str2 += `
            <ul class="submenu">
                ${str3}
              </ul>
            `
        })
        $('.right ').html(str2);
        $('#left>ul>li').on('mouseover', function () {
            var idx = $(this).index();
            $('.right').show();
            $('.right .submenu').eq(idx).css('display', 'flex').siblings('.submenu').hide();
        })
    </script>
</body>

</html>

运行效果：