jQuery 怎么实现文字显示2s,消失0.5s,再显示2s，再消失0.5s,以此循环

<div style="display: none;" id='divTestDisplay'>我要显示的文字</div>  

   window.onload = function () {

           setTimeout(show, 500);

        }

       //显示

        function show() {

            document.getElementById('divTestDisplay').style.display = "block";

            setTimeout(hide, 500);

        }

     //隐藏

        function hide() {

            document.getElementById('divTestDisplay').style.display = "none";

            setTimeout(show, 2000);

        }