<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>定时器</title>
<script type="text/javascript">
function fun()
{
setInterval("fun1()",1000);
}
function fun1()
{
var d=new Date();
document.getElementById("a").innerHTML=d;
}
</script>
</head>
<form>
<input type="button" value="运行" onclick="fun()"/>
<span id="a"></span>
</form>
<body>
</body>
</html>
