jq drop-down menu

Add your own style
<!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 {
        list-style: none;
    }

    /* 清除所有ul的小圆点 */

    .banner {
        margin: 50px auto;
        width: 333px;
        height: 30px;
        background: url("images/bg.jpg") no-repeat;
    }

    .banner li {
        background: url("images/libg.jpg") no-repeat;
    }

    /* 给所有li添加背景图片 */
    .banner>ul>li {
        float: left;
        margin: 0 5px;
        position: relative;
    }

    /* div下的ul的li设置样式 */
    a {
        display: block;
        width: 100px;
        height: 30px;
        text-decoration: none;
        color: black;
        line-height: 30px;
        text-align: center;
    }

    /* 去掉a的下划线，设置样式 */
    .second {
        position: absolute;
        top: 30px;
        display: none;
        /* top: 30px; 因为一级菜单高度30px，top为0就会遮住一级菜单 */
    }

    .second li {
        padding: 5px 13px;
    }
    </style>
</head>

<body>
    <div class="bannersa">
        <ul>
            <li>
                <a href="">一级菜单1</a>
                <ul class="second">
                    <li>二级菜单1</li>
                    <li>二级菜单1</li>
                    <li>二级菜单1</li>
                </ul>
            </li>
            <li>
                <a href="">一级菜单2</a>
                <ul class="second">
                    <li>二级菜单2</li>
                    <li>二级菜单2</li>
                    <li>二级菜单2</li>
                </ul>
            </li>
            <li>
                <a href="">一级菜单3</a>
                <ul class="second">
                    <li>二级菜单3</li>
                    <li>二级菜单3</li>
                    <li>二级菜单3</li>
                </ul>
            </li>
        </ul>
    </div>
    <script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.js"></script>
    <script>
    $(function() {
        $(".bannersa>ul>li").mouseenter(function() {
            $(this).find("ul").css("display", "block");
        });
        // 给div下的一级菜单li注册事件，鼠标进入显示该li下的二级菜单的ul
        $(".bannersa>ul>li").mouseleave(function() {
            $(this).find("ul").css("display", "none");
        });
        // 给div下的一级菜单li注册事件，鼠标离开隐藏该li下的二级菜单的ul

    });
    </script>
</body>

</html>
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