Untitled

<!DOCTYPE html>
<html>
<head>
    <title></title>
</head>
    <body>


        <p id="hide">thank you</p>

        <button id="in">in</button>

        <script  src="https://ajax.aspnetcdn.com/ajax/jQuery/jquery-3.4.1.min.js" />

        <script>

                var show = true;

                $("#in").click(function() {
                    if (show) {
                        $("#hide").fadeOut(function(){
                            show = false;
                            });
                    }else{
                            $("#hide").fadeIn(function(){
                                show = true;
                        });
                    }
                });
        </script>
    </body>
</html>