微信小程序支付

// Order.js 架构
const mongoose = require('mongoose');

const Order = new mongoose.Schema({
  openid: {             // 用户唯一标识
    type: String
  },
  prepay_id: {          // 预支付会话标识
    type: String
  },
  out_trade_no: {       // 商户订单号
    type: String
  },
  transaction_id: {     // 微信订单号
    type: String
  },
  status: {             // 订单状态
    type: Number
  },
  goods: [{             // 商品信息
    good_id: {
      type: Number
    },
    title: {
      type: String
    },
    num: {
      type: Number
    },
    price: {
      type: Number
    },
    img: {
      type: String
    }
  }],
  create_time: {         // 订单创建时间
    type: String
  },
  pay_time: {            // 订单支付时间
    type: String
  }
});

module.exports = mongoose.model('Order', Order);

yarn add md5

const md5 = require('md5')

data: {
  appid: 'wx080a191278b69c58',
  body: '纵翔商城-购物结算',
  mch_id: '1560000000',
	nonce_str: Math.random().toString(36).slice(-8),
  notify_url: 'https://api.domain.com:3000/pay/callback',
  openid: this.getOpenIdByLocal(),
  out_trade_no: 'wx_' + nonce_str + '_' + String(Math.round(new Date())),
  spbill_create_ip: '47.102.154.110',
  total_fee: 0,
  trade_type: 'JSAPI'
}

<view class="tui-pr25">
  <tui-button type="danger" shape="circle" @click="btnPay">确认支付</tui-button>
</view>

/*
* 封装参与签名算法参数ASCII码排序
* https://pay.weixin.qq.com/wiki/doc/api/wxa/wxa_api.php?chapter=4_3
*/
const utils = {
	payParamsSort(str) {
		var strArr = str.split('.');
		var newStr = Array.prototype.sort.call(strArr, function(a, b) {
			for (var i = 0; i < a.length; i++) {
				if (a.charCodeAt(i) == b.charCodeAt(i)) continue;
				return a.charCodeAt(i) - b.charCodeAt(i);
			}
		});
		return newStr;
	}
}

module.exports = {
	payParamsSort: utils.payParamsSort
}

// 获取当前用户openid
getOpenIdByLocal() {
  return uni.getStorageSync('uid');
}

// 将订单提交到商户后台
generateOrders(order) {
  uni.request({
    url: this.baseUrl + '/pay/order', //仅为示例，并非真实接口地址。
    method: 'POST',
    data: {
      order: order
    },
    success: (res) => {
      if(res.status === 200 && res.data.msg == 'ok') {
      	console.log('generate order success');
      }
    }
  });
}

// 支付
btnPay() {
  let keyStr = Object.keys(this.obj);
  let a = '';
  keyStr.forEach((k) => {
    a += (k + '.')
  })		
  let sort = payParamsSort(a.substring(0, a.length - 1));			
  let o = {};
  sort.forEach((s) => {
    o[s] = this.obj[s];
  })				
  let stringA = '';			
  Object.keys(o).forEach((key) => {
    stringA += key + '=' + o[key] + '&';
  });
  console.log(stringA.substring(0, stringA.length - 1));		
  const key = this.key;		
  const stringSignTemp = stringA.substring(0, stringA.length - 1) + "&key=" + key;		
  const sign = md5(stringSignTemp).toUpperCase();					
  this.obj.sign = sign;				

  // 统一下单（预支付）
  uni.request({
    method: 'POST',
    url: this.baseUrl + '/pay/unifiedorder',
    data: this.obj,
    header: {
      'Content-Type': 'application/json'
    },
    success: (res) => {
      console.log(res);

      // 生成商户订单
      const order = {};
      order.openid = this.getOpenIdByLocal();
      order.prepay_id = res.data.result.xml.prepay_id;
      order.out_trade_no = this.obj.out_trade_no;
      order.transaction_id = '';
      order.status = 1;
      order.goods = [];
      order.create_time = String(Math.round(new Date() / 1000));
      order.pay_time = '';
      this.generateOrders(order);

      // 申请支付
      const payObj = {
        appId: 'wx080a191278b69c58',
        timeStamp: String(Math.round(new Date() / 1000)),
        nonceStr: 'zephyr',
        package: 'prepay_id=' + res.data.result.xml.prepay_id,
        signType: 'MD5',
      };
      let keyStr2 = Object.keys(payObj);
      let a = '';
      keyStr2.forEach((k) => {
        a += (k + '.')
      })	
      let sort = payParamsSort(a.substring(0, a.length - 1));		
      let o = {};	
      sort.forEach((s) => {
        o[s] = payObj[s];
      })			
      let stringA = '';
      Object.keys(o).forEach((key) => {
        stringA += key + '=' + o[key] + '&';
      });
      const key = this.key;
      const stringSignTemp = stringA.substring(0, stringA.length - 1) + "&key=" + key; //注：key为商户平台设置的密钥key
      const sign = md5(stringSignTemp).toUpperCase();

      // 小程序调起支付API
      wx.requestPayment({
        'timeStamp': payObj.timeStamp,
        'nonceStr': payObj.nonceStr,
        'package': payObj.package,
        'signType': payObj.signType,
        'paySign': sign,
        'success':function (res) {
          console.log(res);
        },
        'fail':function (res) {
          console.log(res);
        },
        'complete':function (res) {
          console.log(res);
        }
      })
    },
    fail: (err) => {
      console.log(err);
    }
  });
}

// 新增order
async addOrder(ctx, next) {
  const orderItem = new Order(ctx.request.body.order);
  try {
    const res = await orderItem.save();
    ctx.body = {
      code: 1,
      msg: 'ok',
      result: res
    }
  } catch (err) {
    console.log(err);
    ctx.body = {
      code: 0,
      msg: err.message || '服务器错误'
    }
  }
}