小程序支付代码实现

// app.js
App({
  globalData: {
    openid:'',
    payapiUrl:'https://pay-api.example.com',
    wxapiUrl:'https://wx-api.example.com'

  },
  onLaunch() {
    console.log(this.globalData)
    var _this =this;
    // 登录
    wx.login({
      success: res => {
       //console.log(res.code)
       wx.request({
         url: this.globalData.wxapiUrl + '/login',
         method:"POST",
         data:{
           code:res.code
         },
         dataType:"json",
         header: {
           "Content-Type": "application/x-www-form-urlencoded"  
          }
         ,success:function(result){
          //  console.log(result.data.openid)
           _this.globalData.openid = result.data.openid
         }
       })
      }
    })
  }
})

// pages/orderPay/orderPay.js
var app = getApp();
Page({
    data: {
        orderNo:"",
	payMoney:"",
	name:"",
	merchant:""
    },
    onLoad: function (options) {
	if(options.q){ 
            var _this=this;
            var link = decodeURIComponent(options.q);
            var paramArr = link.split('=');
            this.setData({
                orderNo:paramArr[1]
            })
            wx.request({
              url: app.globalData.apiUrl + '/order/getinfo',
              data:{
                  id:paramArr[1]
              },
              success:function(e){
                  console.log(e.data)
                  if(!e.data.amt){
                      wx.redirectTo({
                        url: '/pages/info/error',
                      })
                      return;
                  }
		  //订单状态为已经支付或者已经扫码
		  //TODO:具体订单报错信息
                  if(e.data.status != 0){
                      wx.redirectTo({
                        url: '/pages/info/error',
                      })
                      return;
                  }
                  _this.setData({
                      payInfo:{
			payMoney:e.data.amt,
			name:e.data.name,
			merchant:e.data.merchant
                      }
                  })
              }
            })
          }else{
              wx.redirectTo({
                url: '/pages/info/error',
              })
          }

    },
    //支付函数
    handlePay() {
        var _this = this;
        const {
            payMoney
        } = this.data
        if (payMoney === ''|| payMoney ==0) return
        wx.showLoading({
            title: '加载中',
        })
        wx.request({
            url: app.globalData.apiUrl + '/newpay/wechatPay',
            dataType: "json",
            header: {
                "Content-Type": "application/x-www-form-urlencoded"
            },
            method: "POST",
            data: {
                openid: app.globalData.openid,
                orderNo:_this.data.orderNo
                        },
            success: function (e) {
                wx.hideLoading()
                var rst = e.data.data;
                // var rst = JSON.parse(firstRst);
                wx.requestPayment({
                    timeStamp: rst.timeStamp,
                    nonceStr: rst.nonceStr,
                    package: rst.package,
                    signType: rst.signType,
                    paySign: rst.paySign,
                    success: function (res) {
                        wx.redirectTo({
                            url: '/pages/result/success',
                        })
                        return;
                    },
                    fail: function (res) {
                        _this.setData({
                            showNotice: true
                        })
                    },
                    complete: function (res) {}
                })
            }
        })
    }
})