//index.js
Page({
 data: {

 },
 //點擊支付按鈕進行支付
 payclick: function () {
 var t = this;
 wx.login({
  //獲取code換取openID
  success: function (res) {
  //code = res.code //返回code
  console.log("獲取code");
  console.log(res.code);
  var opid = t.getOpenId(res.code);
  }
 })
 },
 //獲取openID
 getOpenId: function (code) {
 var that = this;
 wx.request({
  url: "https://api.weixin.qq.com/sns/jscode2session?appid=你的appid&secret=AppSecret(小程序密鑰)&js_code=" + code + "&grant_type=authorization_code",
  data: {},
  method: 'GET',
  success: function (res) {
  console.log("獲取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
  }
 })
 },
 //生成商戶訂單
 generateOrder: function (openid) {
 var that = this
 wx.request({
  url: 'http://localhost:25492/wx/getda',//后臺請求地址
  method: 'GET',
  data: {
  gfee: '商品價錢',
  gname: '商品名稱',
  openId: openid
  //（商品價錢和商品名稱根據(jù)自身需要是否傳值, openid為必傳）
  },
  success: function (res) {
  console.log("后臺獲取數(shù)據(jù)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 };
   //發(fā)起支付
  that.pay(param);
  },
  fail: function (res) {
  console.log("向后臺發(fā)送數(shù)據(jù)失敗")
  }
 })
 },
 //支付
 pay: function (param) {
 var that = this;
 console.log("發(fā)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)
  }
 })
 }
})