关于微信小程序实现云支付那些事儿

// 云函数入口文件
const cloud = require('wx-server-sdk')

cloud.init({
  env: cloud.DYNAMIC_CURRENT_ENV
})

const db = cloud.database()

exports.main = async (event) => {

  const wxContent = cloud.getWXContext() // openid等信息
  const openid = wxContent.OPENID
  const appid = wxContent.APPID

  const totalFee = event.totalFee // 支付金额（单位：分）
  const body = event.body // 商品名

  const outTradeNo = createOutTradeNo() // 订单号

  // 获取免鉴权支付参数
  const payMent = await cloud.cloudPay.unifiedOrder({
    "body": body,
    "outTradeNo": outTradeNo,
    "spbillCreateIp": "127.0.0.1",
    "subMchId": "商户号", // 商户号
    "totalFee": totalFee,
    "envId": "对应的云环境id", // 云环境id
    "functionName": "payCallBack" // 支付回调云函数
  })

  // 创建订单
  const nowTime = new Date().getTime()
  const orderObj = {
    _openid: openid,
    appid: appid,
    outTradeNo: outTradeNo,
    totalFee: totalFee * 0.01,
    payStatus: 'wait',
    createTime: nowTime,
    updateTime: nowTime,
    deleteTime: null,
  }
  await addOrder(orderObj)

  return payMent
}


const createOutTradeNo = () => {
  let outTradeNo = new Date().getTime() // 获取当前13位时间戳
  let numStr = '0123456789';
  let randomStr = '';
  for (let i = (32 - 13); i > 0; --i) {
    randomStr += numStr[Math.floor(Math.random() * numStr.length)];
  }
  outTradeNo += randomStr
  return outTradeNo
}


const addOrder = async (orderObj) => {
  return await db.collection('order')
    .add({
      data: orderObj
    })
    .then(res => {
      console.log("创建订单成功 =====>", res, orderObj)
    })
    .catch(err => {
      console.log("创建订单异常 =====>", err, orderObj)
    })
}

// 云函数入口文件
const cloud = require('wx-server-sdk')

cloud.init({
  env: cloud.DYNAMIC_CURRENT_ENV
})

const db = cloud.database()

// 云函数入口函数
exports.main = async (event) => {
  console.log("回调返回对象 =====>", event)
	// 判断条件
  if (event.returnCode == 'SUCCESS') {
    if (event.resultCode == 'SUCCESS') {
      // 查询条件
      const whereObj = {
        appid: event.subAppid, // 小程序的APPID
        _openid: event.subOpenid, // 小程序用户的openid
        outTradeNo: event.outTradeNo, // 商户号的订单号
      }
      // 更新对象
      const updateObj = {
        transactionId: event.transactionId, // 微信方的订单号
        totalFee: event.totalFee * 0.01, // 微信方收到的金额
        timeEnd: event.timeEnd, // 支付结束时间
        payStatus: 'success',
        updateTime: new Date().getTime()
      }
      // 更新订单
      await updateOrder(whereObj, updateObj)
    }
  }
  // 支付回调的返回协议和入参协议（必须返回此结构体，详见文档）
  return {
    errcode: 0,
    errmsg: event.resultCode
  }
}


const updateOrder = async (whereObj, updateObj) => {
  return await db.collection('order')
    .where(whereObj)
    .update({
      data: updateObj
    })
}

// pages/wxPay/wxPay.js
Page({

  
  data: {

  },

  
  onLoad() {},

  
  onShow() {},

  
  async payTap() {
    const totalFee = 2
    const body = '支付测试'
    wx.showLoading({
      title: '调起微信支付中',
      mask: true
    })

    // 获取支付免鉴权参数
    const payMentRes = await this.getPayMent(totalFee, body)
    wx.hideLoading({
      success: (res) => {},
    })
    // 小程序支付API
    const payRes = await this.wxPay(payMentRes.result.payment)
    // 支付API返回结果打印
    console.log(payRes)
  },

  
  wxPay(payment) {
    return new Promise((resolve, rejects) => {
      wx.requestPayment({
        ...payment,
        success(res) {
          resolve({
            status: 'success',
            res: res
          })
        },
        fail(err) {
          resolve({
            status: 'fail',
            res: err
          })
        }
      })
    })
  },

  
  getPayMent(totalFee, body) {
    return new Promise((resolve, rejects) => {
      wx.cloud.callFunction({
        name: 'wxPay',
        data: {
          totalFee,
          body
        },
        success(res) {
          resolve(res)
        },
        fail(err) {
          resolve(err)
        }
      })
    })
  },

})