网页上显示当前的时间和日期

<script language="javascript">

var t = null;

t = setTimeout(time,1000);//开始执行

function time()

{

clearTimeout(t);//清除定时器

dt = new Date();

var y=dt.getYear()+1900;

var mm=dt.getMonth()+1;

var d=dt.getDate();

var weekday=["星期日","星期一","星期二","星期三","星期四","星期五","星期六"];

var day=dt.getDay();

var h=dt.getHours();

var m=dt.getMinutes();

var s=dt.getSeconds();

if(h<10){h="0"+h;}

if(m<10){m="0"+m;}

if(s<10){s="0"+s;}

document.getElementById("timeShow").innerHTML =  "日期："+y+"年"+mm+"月"+d+"日"+weekday[day]+" "+h+":"+m+":"+s+"";

t = setTimeout(time,1000); //设定定时器，循环执行           

}

</script>

显示效果 ：