text: // 云函数入口文件
  const cloud = require('wx-server-sdk')
  
  cloud.init()
  
  const db = cloud.database()
  
  // 云函数入口函数
  exports.main = async (event, context) => {
    const wxContext = cloud.getWXContext()
  
    return await db.collection(event.collectionName).add({
      data: {
        group: event.group,
        uid: event.uid
      }
    })
  }