详解小程序如何接入微信支付(云函数)

小程序
字数统计: 847阅读时长: 4 min
 2019/01/02   Share
小程序接入微信支付.jpg
npm install request
npm install wx-server-sdk


pages/order/order.js

toPay() {
var that = this
if (that.data.hasAddress) {
  // 地址信息
  console.log(that.data.address)
  // 总价信息
  console.log(that.data)
  // 支付后订单信息
  that.getListAfterPay(that)

  // 获取prepay_id，所需的签名字符串
  var p = new Promise((resolve,reject)=>{
    // 生成订单号
    var out_trade_no = (new Date().getTime() + app.RndNum(6)).toString()

    // 生成字符串
    var stringA = 
      "appid="+app.globalData.appid
    + "&attach=test"
    + "&body=JSAPItest"
    + "&device_info=WEB"
    + "&mch_id="+app.globalData.mch_id
    + "&nonce_str="+that.data.nonce_str
    + "&notify_url=http://www.weixin.qq.com/wxpay/pay.php"
    + "&openid="+that.data.openid
    + "&out_trade_no="+out_trade_no
    + "&spbill_create_ip="+that.data.spbill_create_ip
    + "&time_expire="+app.beforeNowtimeByMin(-15)
    + "&time_start="+app.CurrentTime()
    + "&total_fee="+parseInt(that.data.total*100)
    + "&trade_type=JSAPI";

    var stringSignTemp = stringA +"&key="+app.globalData.apikey
    // 签名MD5加密
    var sign = md5.md5(stringSignTemp).toUpperCase()
    // console.log("签名：" + stringSignTemp)
    
    // openid
    var openid = that.data.openid

    resolve([sign,openid,out_trade_no])
  })
  p.then(e => {
    // 生成获取prepay_id请求的xml参数
    var xmlData = '<xml>'+
      '<appid>'+app.globalData.appid+'</appid>'+
      '<attach>test</attach>'+
      '<body>JSAPItest</body>'+
      '<device_info>WEB</device_info>'+
      '<mch_id>'+app.globalData.mch_id+'</mch_id>' +
      '<nonce_str>'+that.data.nonce_str+'</nonce_str>' +
      '<notify_url>http://www.weixin.qq.com/wxpay/pay.php</notify_url>' +
      '<openid>'+that.data.openid+'</openid>'+
      '<out_trade_no>'+e[2]+'</out_trade_no>'+
      '<spbill_create_ip>'+that.data.spbill_create_ip+'</spbill_create_ip>'+
      '<time_expire>'+app.beforeNowtimeByMin(-15)+'</time_expire>'+
      '<time_start>'+app.CurrentTime()+'</time_start>'+
      '<total_fee>'+parseInt(that.data.total * 100)+'</total_fee>'+
      '<trade_type>JSAPI</trade_type>'+
      '<sign>'+e[0]+'</sign>'+
      '</xml>'

    // console.log(xmlData)

    // 获取prepay_id,发送支付请求
    wx.cloud.callFunction({
      name:'pay',
      data:{
        xmlData:xmlData
      }
    })
    .then(res=>{
      if(res){
        var prepay_id = res.result.body.split("<prepay_id><![CDATA[")[1].split("]]></prepay_id>")[0];
        var timeStamp = Math.round((Date.now() / 1000)).toString()
        var nonceStr = app.RndNum()
        var stringB =
          "appId=" + app.globalData.appid
          + "&nonceStr=" + nonceStr
          + "&package=" + 'prepay_id=' + prepay_id
          + "&signType=MD5"
          + "&timeStamp=" + timeStamp
        var paySignTemp = stringB + "&key=" + app.globalData.apikey
        // 签名MD5加密
        var paySign = md5.md5(paySignTemp).toUpperCase()
        // 调起请求
        wx.requestPayment({
          appId: app.globalData.appid,
          timeStamp: timeStamp,
          nonceStr: nonceStr,
          package: 'prepay_id=' + prepay_id,
          signType: 'MD5',
          paySign: paySign,
          success: function (e) {
            console.log(e)
          }
        })
      }
    })
    .catch(err=>{
      console.log(err)
    })

  // end获取openid
  })

// end if 地址  
}

else{
  wx.showModal({
    title: 'Oh No',
    content: '请填写收货地址~',
  })
}
}

cloudfunctions/pay/index.js 

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

cloud.init()

// 云函数入口函数
exports.main = async (event, context) => {  
  let result = await getPrepayIdPromise(event);
  return result
}

const getPrepayIdPromise = function (event) {
  return new Promise((resolve, reject) => {
    let options = {
      "url": 'https://api.mch.weixin.qq.com/pay/unifiedorder',
      "method": "POST",
      "headers": {
        "Content-Type": "text/xml",
        "charset": "utf-8"
      },
      "form": event.xmlData
    };
    request.post(options, (err, result, body) => {
      resolve({
        err: err,
        body: body
      })
    })
  })
}


cloudfunctions/getIP/index.js


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

cloud.init()

// 云函数入口函数
exports.main = async (event, context) => {
  let result = await getIPAddressPromise();
  return result
}

const getIPAddressPromise = function () {
  return new Promise((resolve, reject) => {
    let options = {
      "url": 'http://ip-api.com/json'
    };
    request.post(options, (err, result, body) => {
      resolve({
        err: err,
        body: body
      })
    })
  })
}
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