1、源码如下
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GBK">
<title>404 Not Found</title>
</head>
<body>
<h1>找不到指定的页面</h1>
<span id="totalSecond">3</span>秒后自动返回
</body>
<script language="javascript" type="text/javascript">
<!--
var second = document.getElementById('totalSecond').textContent;
if (navigator.appName.indexOf("Explorer") > -1) //判断是IE浏览器还是Firefox浏览器，采用相应措施取得秒数
{
second = document.getElementById('totalSecond').innerText;
} else
{
second = document.getElementById('totalSecond').textContent;
}
setInterval("redirect()", 1000); //每1秒钟调用redirect()方法一次
function redirect()
{
if (second < 0)
{
location.href = 'http://www.baidu.com';
} else
{
if (navigator.appName.indexOf("Explorer") > -1)
{
document.getElementById('totalSecond').innerText = second--;
} else
{
document.getElementById('totalSecond').textContent = second--;
}
}
}
-->
</script>
</html></td>
</tr>
</table>（1）初始化
（2）跳转后
