查询商品分类名 websocket测试 GET http://120.79.74.49:8883/good/listname 响应参数 参数名 类型 描述 必填 code string 示例：200 必填 flag boolean 示例：true 必填 msg string 示例：查询到6条数据 必填 selectNum int 查询到的条数 示例：6 必填 data array 查询到的数据 数据列表 必填 id int 示例：1 必填 title string 示例：白酒 必填 classify string 示例：["茅台","五粮液","剑南春","汾酒","郎酒","古井贡酒","舍得","酒鬼","习酒","董酒","珍酒","水井坊","西凤","杜康","四特","台湾高粱酒","泸州老窖","全兴","国台","小糊涂仙"] 必填