<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
<script>
window.onload=function(){
var a=new Date(); //向id为a的p中输出时间
//document.getElementById("a").innerHTML=a;
//向当前文档输出时间
document.write(a);
} </script>
</head>
<body>
<p id="a"></p>
</body>
</html>