大神们我这个代码什么都不显示哪里有问题了？
<!DOCTYPE html>
<html>
<head>
<title>
date
</title>
<script type="text/javascript">
function showtom(){
var udate = new Date()
var n=udate.getFullYear();
var y=udate.getMonth()+1;
var r=udate.getDate();
var s=udate.getHours();
var f=udate.getMinutes();
var m=udate.getSeconds();
document.getElementById("con").innerHTML=n+"/"+y+"/"+r+s+":"+f+":"+m;
setTimeout("showtom()",500)
}
</script>
</head>
<body onload="showtom">
<p id="con">
</p>
</html>
