林兴陆（小林）LINXINGLU.COM

city = GetCookie(“city”);
if(!city){
   city = LookupCity(REMOTE_ADDR);
   if(city){
      SetCookie(“city”,city);
   }
   else{
      city = “Beijing”;
   }
}
WeatherShow(city);

// TODO: GetCookie / SetCookie / LookupCity / WeatherShow