jquery 事件冒泡

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
   <meta charset="utf-8" />
    <script src="jquery-3.3.1.js"></script>
    <script>
        $(function () {
            //事件冒泡
            $('div').click(function () {
                alert($(this).attr('id'));
            });
            $('p').click(function () {
                alert($(this).attr('id'));
            });
            $('strong').click(function () {
                alert($(this).attr('id'));
                return false; //停止冒泡
            });
        })
    </script>
</head>
<body>
    <div id="dv" style="300px;height:200px;background-color:yellow">
        <p id="p1" style="100px;height:100px;background-color:blue">
            <strong id="st">加粗</strong>
        </p>
    </div>
</body>
</html>