<html>
    <head>
        <meta charset=utf-8>
    </head>
    <body>
        <ul>
            <li>nowcoder</li>
        </ul>
    </body>
    <script type="text/javascript">
        // 补全代码
        var item = document.querySelector("li")
        item.addEventListener('click', e =>{
            e.stopPropagation()
        })
    </script>
</html>