[代码]const cloud = require('wx-server-sdk')cloud.init({  env: cloud.DYNAMIC_CURRENT_ENV})const db = cloud.database()const MAX_LIMIT = 100exports.main = async (event, context) => {  // 先取出集合记录总数  const countResult = await db.collection('todos').count()  const total = countResult.total  // 计算需分几次取  const batchTimes = Math.ceil(total / 100)  // 承载所有读操作的 promise 的数组  const tasks = []  for (let i = 0; i < batchTimes; i++) {    const promise = db.collection('todos').skip(i * MAX_LIMIT).limit(MAX_LIMIT).get()    tasks.push(promise)  }  // 等待所有  return (await Promise.all(tasks)).reduce((acc, cur) => {    return {      data: acc.data.concat(cur.data),      errMsg: acc.errMsg,    }  })}[代码] // 云函数入口文件 const cloud = require('wx-server-sdk') cloud.init() const db = cloud.database({env:'pmis - 4c63d'}) const $ = db.command.aggregate const _=db.command const MAX_LIMIT = 100 // 云函数入口函数 exports.main = async(event, context) => {   const countResult = await db.collection('jxgs').aggregate()     .lookup({       from: 'jxgsquexian',       let: {         bdzname: '$bdzname',         sbyxbh: '$sbyxbh'       },       pipeline: $.pipeline()         .match(_.expr($.and([           $.eq(['$bdzname', '$$bdzname']),           $.eq(['$sbyxbh', '$$sbyxbh'])         ])))         .done(),       as: 'quanxianList',     }).count("total").end();   const total = countResult.total   // 计算需分几次取   const batchTimes = Math.ceil(total / MAX_LIMIT)   // 承载所有读操作的 promise 的数组   const tasks = []   for (let i = 0; i < batchTimes; i++) {     const promise = db.collection('jxgs').aggregate()       .lookup({         from: 'jxgsquexian',         let: {           bdzname: '$bdzname',           sbyxbh: '$sbyxbh'         },         pipeline: $.pipeline()           .match(_.expr($.and([             $.eq(['$bdzname', '$$bdzname']),             $.eq(['$sbyxbh', '$$sbyxbh'])           ])))           .done(),         as: 'quanxianList',       }).skip(i * MAX_LIMIT).limit(MAX_LIMIT).end();     tasks.push(promise);   }   // 等待所有   return (await Promise.all(tasks)).reduce((acc, cur) => {     return {       data: acc.data.concat(cur.data),       errMsg: acc.errMsg,     }   }) } 这么改有什么问题？折腾好几天了，哪位大神指点一下

// 云函数入口文件 const cloud = require('wx-server-sdk') cloud.init() const db = cloud.database({env:'pmis - 4c63d'}) const $ = db.command.aggregate const _=db.command const MAX_LIMIT = 100 // 云函数入口函数 exports.main = async(event, context) => {     const countResult = await db.collection('jxgs').aggregate()     .lookup({       from: 'jxgsquexian',       let: {         bdzname: '$bdzname',         sbyxbh: '$sbyxbh'       },       pipeline: $.pipeline()         .match(_.expr($.and([           $.eq(['$bdzname', '$$bdzname']),           $.eq(['$sbyxbh', '$$sbyxbh'])         ])))         .done(),       as: 'quanxianList',     }).count("total").end();   const total = countResult.total   // 计算需分几次取   const batchTimes = Math.ceil(total / MAX_LIMIT)   // 承载所有读操作的 promise 的数组   const tasks = []   for (let i = 0; i < batchTimes; i++) {     const promise = db.collection('jxgs').aggregate()       .lookup({         from: 'jxgsquexian',         let: {           bdzname: '$bdzname',           sbyxbh: '$sbyxbh'         },         pipeline: $.pipeline()           .match(_.expr($.and([             $.eq(['$bdzname', '$$bdzname']),             $.eq(['$sbyxbh', '$$sbyxbh'])           ])))           .done(),         as: 'quanxianList',       }).skip(i * MAX_LIMIT).limit(MAX_LIMIT).end();     tasks.push(promise);   }   // 等待所有   return (await Promise.all(tasks)).reduce((acc, cur) => {     return {       data: acc.data.concat(cur.data),       errMsg: acc.errMsg,     }   })   }