<HEAD> <TITLE> New Document </TITLE> <META NAME="Generator" CONTENT="EditPlus"> <META NAME="Author" CONTENT="milk"> <mce:style type="text/css"><!-- body{ font-family: verdana; } #tip{ position: absolute; top: 250px; left: 100px; font: 2em; background: #3366FF; } --></mce:style><style type="text/css" mce_bogus="1"> body{ font-family: verdana; } #tip{ position: absolute; top: 250px; left: 100px; font: 2em; background: #3366FF; } </style> <mce: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'>!</div>"); } else writeCookie(); } // --></mce:script> </HEAD> <BODY> </body>