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JavaScript 不能实现跨域读写 Cookie。下面是JS对cookie 的常用操作

//获得Cookie解码后的值
function GetCookieVal(offset)
{
   var endstr = document.cookie.indexOf (";", offset);
   if (endstr == -1)
   endstr = document.cookie.length;
   return unescape(document.cookie.substring(offset, endstr));
}



//设定Cookie值
function SetCookie(name, value)
{
   var expdate = new Date();
   var argv = SetCookie.arguments;
   var argc = SetCookie.arguments.length;
   var expires = (argc > 2) ? argv[2] : null;
   var path = (argc > 3) ? argv[3] : null;
   var domain = (argc > 4) ? argv[4] : null;
   var secure = (argc > 5) ? argv[5] : false;
   if(expires!=null) expdate.setTime(expdate.getTime() + ( expires * 1000 ));
   document.cookie = name + "=" + escape (value) +((expires == null) ? "" : ("; expires="+ expdate.toGMTString()))
   +((path == null) ? "" : ("; path=" + path)) +((domain == null) ? "" : ("; domain=" + domain))
   +((secure == true) ? "; secure" : "");
}

//删除Cookie
function DelCookie(name)
{
   var exp = new Date();
   exp.setTime (exp.getTime() - 1);
   var cval = GetCookie (name);
   document.cookie = name + "=" + cval + "; expires="+ exp.toGMTString();
}

//获得Cookie的原始值
function GetCookie(name)
{
   var arg = name + "=";
   var alen = arg.length;
   var clen = document.cookie.length;
   var i = 0;
   while (i < clen)
   {
       var j = i + alen;
       if (document.cookie.substring(i, j) == arg)
           return GetCookieVal (j);
       i = document.cookie.indexOf(" ", i) + 1;
       if (i == 0) break;
   }
   return null;
}
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