thinkPHP框架实现多表查询的方法

$where = array();
$where['meiyepin_feedback.member_id'] = "1";
$Model = M('feedback');
  $a = $Model
  ->join('meiyepin_member ON meiyepin_feedback.member_id = meiyepin_member.member_id')
  ->where($where)
  ->select();
var_dump($a);exit;