| javascript控制cookie进行首次页面跳转 |
| 作者：milk35340704 来源：bbs 整理日期：2007-10-19 |
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="milk">
<style type="text/css">
body{
font-family: verdana;
}
#tip{
position: absolute;
top: 250px;
left: 100px;
font: 2em;
background: #3366FF;
}
</style>
<script type="text/javascript">
//创建cookie的函数
function writeCookie ()
{
//创建一个时间对象，用于确定cookie保留时间
var destoryTime = new Date();
//cookie在24小时后销毁
destoryTime.setTime(destoryTime.getTime() + 24 * 3600 * 1000);
//转为GMT时间
var expireTime = destoryTime.toGMTString();
//写入cookie
document.cookie = "visited=true" + ";expires=" + expireTime + ";";
//////创建提示窗口
document.write("<div id=tip>欢迎首次光临BlueIdea论坛，5秒之后您将返回论坛首页...</div>");
setTimeout("backToMainPage()",5000);
}
//返回函数
function backToMainPage()
{
window.location.href = "http://bbs.blueidea.com";
}
var isCookieExist;
//检查cookie是否存在
isCookieExist = document.cookie.length;
//若cookie不存在则调用函数写入
if(!isCookieExist)
writeCookie();
//若存在则检测cookie值
else
{
//取出cookie值
var cookieContent = document.cookie;
//取出cookie状态
var checkStatus = "visited=";
//查找是否存在字符串visited=
var startIndex = cookieContent.indexOf(checkStatus);
//若查找的值存在
if(startIndex != -1)
{
//把位置锁定到"="的后面
startIndex += checkStatus.length;
//从=后开始查找符号","
var endIndex = cookieContent.indexOf(",",startIndex);
if(endIndex == -1)
endIndex = cookieContent.length;
//取出visited=后的字串
var result = unescape(cookieContent.substring(startIndex,endIndex));
if(result != "true")
writeCookie();
else
document.write("<div id=tip>欢迎再次来到BlueIdea论坛！</div>");
}
else
writeCookie();
}
</script>
</HEAD>
<BODY>
</BODY> |
|
|
