Secondary navigation bar flickering problem

【Foreword】

Student question: Occasionally there is a flickering problem when the secondary navigation slides over, and it looks unstable

【main body】

(1) Reason analysis: This situation is generally caused by the event binding the wrong element

(2) Distinguish the bound elements clearly. When implementing with jQuery, pay attention to binding li. Below I share a demo I just made, for reference and understanding

<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
    <title>Dropdown menu</title>
    <!--Referencing the jQuery library of Baidu server-->
    <script src="http://libs.baidu.com/jquery/1.9.0/jquery.js"></script>
    <style type="text/css">
        /*CSS global settings*/
        *{
            margin:0;
            padding:0;
        }
        .are not{
            background-color:#EEEEEE;
            height:40px;
            width:450px;
            margin:0 auto;
        }
        ul {
            list-style:none;
        }
        .nav>ul ul{
            position: absolute;
            display: none;
            top: 50px;
        }
        ul li{
            padding-bottom: 20px;
            float: left;
            line-height: 40px;
            text-align: center;
        }
        a{
            text-decoration: none;
            color: #000000;
            display: block;
            width: 90px;
            height: 40px;
        }
        a:hover{
            background-color:#666666;
            color:#FFFFFF;
        }
        ul li ul li{
            padding-bottom: 0px;
            float:none;
            background-color:#EEEEEE;
        }
        ul li ul{
            display:none;
        }
        /*In order to be compatible with CSS styles written by IE7, but must be written before a:hover*/
        ul li ul li a:link,ul li ul li a:visited{
            background-color:#EEEEEE;
        }
        ul li ul li a: hover {
            background-color:#009933;
        }
    </style>
</head>

<body>
<div id="nav" class="nav">
    <ul>
        <li><a href="#">网站首页</a></li>
        <li class="navmenu"><a href="#">课程大厅</a>
            <ul>
                <li><a href="#">JavaScript</a></li>
                <li><a href="#">jQuery</a></li>
                <li><a href="#">Ajax</a></li>
            </ul>
        </li>
        <li class="navmenu"><a href="#">学习中心</a>
            <ul>
                <li><a href="#">视频学习</a></li>
                <li><a href="#">案例学习</a></li>
                <li><a href="#">交流平台</a></li>
            </ul>
        </li>
        <li><a href="#">经典案例</a></li>
        <li><a href="#">关于我们</a></li>
    </ul>
</div>
<script>
    $(function(){
        $(".navmenu").mouseover(function(){
            $(this).children("ul").show();
        })
        $(".navmenu").mouseout(function(){
            $(this).children("ul").hide();
        })
    })
</script>
</body>
</html>

Secondary navigation bar flickering problem

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