<script language="javascript">
//写入cookie
function setCookies(name,value)
{
   var Days = 30; //此 cookie 将被保存 30 天
   var expdate   = new Date();
   expdate.setTime(expdate.getTime() + Days*24*60*60*1000);
   document.cookie = name + "="+ escape(value) +";expire*="+ expdate.toGMTString();
}
//读取cookie
function getCookies(name)
{
   var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));
   if(arr != null) return unescape(arr[2]); return null;
}
//删除cookie
function delCookies(name)
{
   var exp = new Date();
   exp.setTime(exp.getTime() - 1);
   var cval=getCookie(name);
   if(cval!=null) document.cookie=name +"="+cval+";expire*="+**p.toGMTString();
}
//示例读取
var sCookie = getCookies("sCookie");
if (sCookie == "null"){
sCookie = "默认";
}
setTimeout("document.getElementById('cookie').innerHTML=sCookie;",1000);
</script>

           <div id="cookie">loading...</div>

结束。