HTML标签数值，实现自动倒计时

<script  type="text/javascript"> 
function delayURL(url) {
    var delay = document.getElementById("time_tz").innerHTML;
    if (delay > 0) {
        delay--;
        document.getElementById("time_tz").innerHTML = delay;
    } else {
      //这个暂时不能跳转
        location.href = url;
    }
    setTimeout("delayURL('" + url + "')", 1000);
} 

delayURL("www.baidu.com");
</script>

 

 

HTML实现自动跳转

<meta http-equiv="Refresh" content="3; url=www.baidu.comr" />