public function getAnchorByPopularity($page, $pagesize){
        //验证参数的正确性
        if(!is_numeric($page) || !is_numeric($pagesize)){
            throw new Exception(__METHOD__ . "error param");
        }
        $page = ($page > 0) ? $page - 1 : 0;
        $pagesize = ($pagesize > 0) ? $pagesize : 20;

        $param = func_get_args();
        $redisKey = "autoapp_".__METHOD__ . implode("_", $param);
        $redisVal = $this->redis->get($redisKey);
        if($redisVal === false){
            if ($pagesize > 0) {
                $start = $page * $pagesize;
                $order = "FPopularity desc";
                $limit = "{$start}, {$pagesize}";
               // $limit = "{0},{1}";
            } else {
                $limit = "";
            }
            //从MySQL数据库读取数据
            
            //如果读取数据不为空，把数据存入redis
            if(!empty($list)){
                $this->redis->setex($redisKey, $this->cacheTime, $list);
            }
        }
        else{
            $list = unserialize($redisVal);
        }
        return $list;
    }