<!DOCTYPE html>
<html lang="en">
 
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="./js/jquery.min.js"></script>
    <style>
        .nav li ul {
            display: none;
        }
    </style>
</head>
 
<body>
    <ul class="nav">
        <li>
            <a href="#">微博</a>
            <ul>
                <li><a href="">私信</a></li>
                <li><a href="">私信</a></li>
                <li><a href="">私信</a></li>
            </ul>
        </li>
 
    </ul>
    <script>
        $(function() {
            $(".nav>li").mouseover(function() {
                //鼠标经过
                //当前的元素
                $(this).children("ul").show();
            });
            $(".nav>li").mouseleave(function() {
                //鼠标经过
                //当前的元素
                $(this).children("ul").hide();
            });
        })
    </script>
</body>
 
</html>

运行结果

jq-新浪下拉菜单-12_jquery