url关掉、ajax都可以

 public function pdf_sleep(){
        ignore_user_abort(true);
        set_time_limit(0);
        echo 'Testing connection handling in PHP';
        while(1)
        {
            // Did the connection fail?
            if(connection_status() != CONNECTION_NORMAL)
            {
                break;
            }
            Db::name('flink')->insert(['name'=>'a']);
            // Sleep for 10 seconds
            sleep(10);
        }
    }