微信小程序前端支付

原文地址

//index.js
Page({
  data: {

  },
  //点击支付按钮进行支付
  payclick: function () {
    var t = this;
    wx.login({
      //获取code换取openID
      success: function (res) {
        //code = res.code //返回code
        console.log("获取code");
        console.log(res.code);
        var opid = t.getOpenId(res.code);
      }
    })
  },
  //获取openID
  getOpenId: function (code) {
    var that = this;
    wx.request({
      url: "https://api.weixin.qq.com/sns/jscode2session?app + code + "&grant_type=authorization_code",
      data: {},
      method: 'GET',
      success: function (res) {
        console.log("获取openid")
        console.log(res)
        that.setData({
          openid: res.data.openid,
          session_key: res.data.session_key
        })
        that.generateOrder(res.data.openid)
      },
      fail: function () {
        // fail
      },
      complete: function () {
        // complete
      }
    })
  },
  //生成商户订单
  generateOrder: function (openid) {
    var that = this
    wx.request({
      url: 'http://localhost:25492/wx/getda',//后台请求地址
      method: 'GET',
      data: {
        gfee: '商品价钱',
        gname: '商品名称',
        openId: openid
        //（商品价钱和商品名称根据自身需要是否传值, openid为必传）
      },
      success: function (res) {
        console.log("后台获取数据成功");
        console.log(res);
        var param = { "timeStamp": res.data.timeStamp, "package": res.data.package, "paySign": res.data.paySign, "signType": "MD5", "nonceStr": res.data.nonceStr };
         //发起支付
        that.pay(param);
      },
      fail: function (res) {
        console.log("向后台发送数据失败")
      }
    })
  },
  //支付
  pay: function (param) {
    var that = this;
    console.log("发起支付")
    console.log(param)
    wx.requestPayment({
      timeStamp: param.timeStamp,
      nonceStr: param.nonceStr,
      package: param.package,
      signType: param.signType,
      paySign: param.paySign,
      success: function (res) {
        console.log("success");
        console.log(res);
      },
      fail: function (res) {
        console.log("fail")
        console.log(res);
      },
      complete: function (res) {
        console.log("complete");
        console.log(res)
      }
    })
  }
})