微信小程式--使用雲開發完成支付閉環
阿新 • • 發佈：2021-02-01
#### 微信小程式--使用雲開發完成支付閉環
#### 1.流程介紹
#### 2. 程式碼實現和邏輯思想描述
> 雲函式統一下單 對應雲函式 **unipay**
> [【CloudPay.unifiedOrder】](https://developers.weixin.qq.com/miniprogram/dev/wxcloud/reference-sdk-api/open/pay/CloudPay.unifiedOrder.html)
> **函式思路** : 呼叫雲函式封裝功能，用時間戳生成對應訂單號，進行統一下單處理，如果兩個返回結果都是`SUCCESS`,那麼將該訂單記錄寫入資料庫，狀態設定為`waiting`
1. body填寫商戶名稱
2. subMchId填寫商戶ID，在雲函式環境管理後臺獲取
~~~js
const cloud = require('wx-server-sdk')
cloud.init({
env: ''
})
const db = cloud.database();
const _ = db.command;
exports.main = async (event, context) => {
var fee = parseInt(event.fee);
let paydata = event.paydata;
let tradeno = GetTradeNo();
const res = await cloud.cloudPay.unifiedOrder({
"body": "",
"outTradeNo": tradeno,
"spbillCreateIp": "127.0.0.1",
"subMchId": "",
"totalFee": fee,
"envId": "雲函式環境ID",
"functionName": "unipaynotify"
})
res.outTradeNo = tradeno
res.totalFee = fee
//在此處寫入訂單表
paydata.paytimestamp = res.payment.timeStamp;
paydata.orderid = res.outTradeNo;//訂單號
paydata.paystatus = 'waiting'
paydata.orderamount = fee
paydata.paytime = TimeCode()
paydata.mchid = res.subMchId
if(res.returnCode=='SUCCESS' && res.resultCode=='SUCCESS'){
db.collection('pay_record').add({
data:paydata
})
}
return res
}
function GetTradeNo() {
var outTradeNo = ""; //訂單號
for (var i = 0; i < 6; i++) //6位隨機數，用以加在時間戳後面。
{
outTradeNo += Math.floor(Math.random() * 10);
}
outTradeNo = "LHZHWY" + new Date().getTime() + outTradeNo; //時間戳，用來生成訂單號。
return outTradeNo;
}
function TimeCode() {
var date = new Date();
var year = date.getFullYear()
var month = date.getMonth() + 1
var day = date.getDate()
var hour = date.getHours()
var minute = date.getMinutes()
var second = date.getSeconds()
return [year, month, day].map(formatNumber).join('-') + ' ' + [hour, minute, second].map(formatNumber).join(':')
}
function TimeCodeYmd(){
var date = new Date();
var year = date.getFullYear()
var month = date.getMonth() + 1
var day = date.getDate()
return [year, month, day].map(formatNumber).join('-');
}
function formatNumber(n) {
n = n.toString()
return n[1] ? n : '0' + n
}
~~~
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