$sql = "select `ProductID`,`product`,`prefix`,`abstract`,`CategoryName`,`supplier`,`UnitPrice`,`SellingPrice`, `Discount`,`UnitsInStock`, `UnitsOnOrder`,`unit`,`description`, concat('http://106.54.245.78/weicms/Picture/',imgurl) AS `imgurl`,`deliver`,`pickup` from `cai_product` where `BigCategoryName`='".$bigcategoryname."' order by  `BigCategoryName` desc limit ".$lastid.",".$limit.";";   

微信小程序获取后台PHP数据只能获得BigCategoryName="蔬菜"的数据是为什么？

console.log(res.data);获取的json串是这样的