我需要帮助在Express中使用mongooose数据库进行排序。当我使用sort（{'price'：1}）时，一切都很好，但是当我传递JSON.stringify（sort）时，它包含并注销{“price”：1}，它就停止工作了。知道为什么吗？

if(req.query.sortOption){
    const str = req.query.sortOption.split(':');
    sort[str[0]] = str[1] === 'desc' ? -1:1;
  }

  console.log(JSON.stringify(sort));
//here logs out {"price":-1} which works when i pass it into sort function as a string

  try {
    const annoucements = await Annoucement.find(query)
      .skip(page * annoucementsPerPage)
      .limit(annoucementsPerPage)
      .populate('author')
      .sort(JSON.stringify(sort))
    res.status(200).json({
      status: 'Successfully got an annoucement',
      results: annoucements.length,
      data: {
        annoucements,
      },
    });
  } catch (error) {
    res.status(500).json({
      status: 'Failed to get all annoucements',
      message: error,
    });
  }
};