JS利用cookies设置每隔24小时弹出框

function cookieGO(name) {  var today = new Date();  var expires = new Date();  expires.setTime(today.getTime() + 1000*60*60*24);  setCookie("cookievalue", name, expires);  }  function setCookie(name, value, expire) {   window.document.cookie = name + "=" + escape(value) + ((expire == null) ? "" : ("; expires=" + expire.toGMTString()));  }  function getCookie(Name) {   var findcookie = Name + "=";  if (window.document.cookie.length > 0) { // if there are any cookies   offset = window.document.cookie.indexOf(findcookie);  if (offset != -1) { // cookie exists 存在   offset += findcookie.length;   // set index of beginning of value   end = window.document.cookie.indexOf(";", offset)   // set index of end of cookie value   if (end == -1)   end = window.document.cookie.length;   return unescape(window.document.cookie.substring(offset, end));   }  }  return null;  }  //提示过期弹框  if({$remindflag} == "1"){   setInterval(function TanChuang() {   var c = getCookie("cookievalue");   if (c != null) {    return;   }   cookieGO("getcookie");    G.alert({     "title":"过期提示",     "pclass":"box",     "text":"您的错题本服务将于"+"{$userinfo.member_end}"+"过期<br>为了不影响您的正常使用请续费",     "btnText":"购买续费",     "alert":function(){      this._remove();      window.location.href = "/manage/pay/readyopenvip.php";     }    });   },2000);  }