setTimeout()?

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<head><title>简单的动态时钟</title><head>
<body onload="nowTime()">
<script type="text/javascript">
  function nowTime(){var nowData = new Date();
var year = nowData.getYear();
var month = nowData.getMonth();
 month += 1;
var day = nowData.getDate();
var hour = nowData.getHours();
var minute = nowData.getMinutes();
var second = nowData.getSeconds();document.getElementById("div1").innerText=year+"年"+month+"月"+day+"日"+hour+"点"+minute+"分"+second+"秒";
setTimeout("nowTime()",1000);
}</script>
<div id=div1>&nbsp;
</div>
</body>
</html>