实现功能如演示：http://bbs.tgtan.com/forum.php?mod=forumdisplay&fid=56
var fid = $_G[fid];
if(fid == 56)
{
var bln = window.confirm("本版块只允许18岁以上访问，确定够18了?");
if(bln === false){
window.location.href = 'http://www.tgtan.com/';
}
}
</script>
window.location.href = 'http://www.tgtan.com/';这行代码可以任意修改 跳转指定页面。
window.history.back(); 这是返回上一步操作。
window.location.href,常用JS返回，刷新，关闭，弹窗
1 history.go(0)
2 location.reload()
3 location=location
4 location.assign(location)
5 document.execCommand('Refresh')
6 window.navigate(location)
7 location.replace(location)
8 document.URL=location.href
这几个都可以刷新
window.location.reload();刷新
window.location.href=window.location.href;刷新
window.close();关闭窗口，不弹出系统提示，直接关闭
window.close()相当于self属性是当前窗口
window.parent.close()是parent属性是当前窗口或框架的框架组
页面实现跳转的九种方法实例：
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>navigate</title>
<script language="javascript">
setTimeout('window.navigate("top.html");',2000);
setTimeout('window.document.location.href="top.html";',2000);
setTimeout('window.document.location="top.html";',2000);
setTimeout('window.location.href="top.html";',2000);
setTimeout('window.location="top.html";',2000);
setTimeout('document.location.href="top.html";',2000);
setTimeout('document.location="top.html";',2000);
setTimeout('location.href="top.html";',2000);
setTimeout('location.replace("top.html")',2000);
//window对象
//document对象
//location对象
//href属性
//1.window.document.location.href
//2.window.document.location
//3.window.location.href
//4.window.location
//5.document.location.href
//6.document.location
//7.location.href
//8.window.navigate
//9.location.replace
//只要使用location方法，和任意的window对象，location对象，href属性连用，都可以页面的跳转////
</script>
</head>
<body>
页面将在2秒后跳转
</body>
</html>
解释：
location是个对象，比如本页的document.location和window.location的属性有
location.hostname = community.csdn.net
location.href = http://community.csdn.net/Expert/topic/4033/4033372.xml?temp=2.695864E-02
location.host = community.csdn.net
location.hash =
location.port =
location.pathname = /Expert/topic/4033/4033372.xml
location.search = ?temp=2.695864E-02
location.protocol = http:
可见href是location的属性，类别是string
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