5秒后跳转效果

setInterval版

  $(function () {
            setInterval(function () {
                var time = $("#time").text();
                time = parseInt(time);
                time--;
                if (time >0) {
                    $("#time").text(time);
                } else {
                    window.location = $("#url").attr("href");
                }
            }, 1000);
        });

SetTimeOut版

<script type="text/javascript">
        window.onload = function () {
            setTimeout(changeTime, 1000);
        }
        function changeTime() {
            var time = document.getElementById("time").innerHTML;
            time = parseInt(time);
            time--;
            if (time <= 0) {
                var url = document.getElementById("url").href;
                window.location = url;
            } else {
                document.getElementById("time").innerHTML= time;
                setTimeout(changeTime, 1000);
            }
        }
    
    </script>

html

 <span style="font-size: 18px; color: Red" id="time">5</span>秒钟以后跳转到 <a href="<%=this.url %>"