封装在utils里

const collectionGet = async function (collectionName, getData = {}) {
  let {
    where,
    skip,
    limit
  } = getData;


  where = where ? where : {};
  skip = skip ? skip : 0;
  limit = limit ? limit : 5;


  wx.showLoading({
    title: '加载ing...',
  })

  try {
    const res = await db.collection(collectionName).where(where).skip(skip).limit(limit).get();
    return res['data'];
  } catch (error) {
    return error;
  } finally{
    wx.hideLoading({
      success: (res) => {},
    })
  }
}

页面调用很方便：

    const result_get=await utils.collectionGet("compositions",{
      where:{
        _id:docid
      }
    });