$field="a.id as user_id,a.user_nick,a.user_phone,a.sex,a.agent_id,a.industry_type,a.price_demand,a.area_demand,a.create_time,b.name,b.phone";
$field="a.id as user_id,a.user_nick,a.user_name,a.user_phone,a.sex,a.agent_id,a.industry_type,a.price_demand,a.area_demand,a.create_time,b.name,b.phone";