隔行换色的老有关问题

      //方法一
      while($result=mysql_fetch_array($query)){
    $bgcolor=($bgcolor=="blue") ? "white" : "blue";
    echo "";
    echo "{$result['gname']}";
    echo "{$result['endtime']}";
    echo "{$result['current_price']}";
    echo "{$result['reply_num']}";
    echo "";
      }

      //方法二
       $flag=1;
      while($result=mysql_fetch_array($query)){
    if($flag % 2 == 0) $bgcolor="yellow";else $bgbolor="white"; //这种方式理论上可以阿
    echo "";
    echo "{$result['gname']}";
    echo "{$result['endtime']}";
    echo "{$result['current_price']}";
    echo "{$result['reply_num']}";
    echo "";
    $flag++;
      }