微信小程序支付开发教程

 onLoad: function () {
    var that = this
    wx.login({
      success: function (res) {
        if (res.code) {
          //发起网络请求
          wx.request({
            url: 'https://api.weixin.qq.com/sns/jscode2session?appid=wxaacf22345345cfc7162fe3&secret=83ebd41c3e6f34a49b3a34578063434548ff3f71&js_code=' + res.code + '&grant_type=authorization_code',
            method: "POST",
            success: function (res) {
              that.setData({
                openid: res.data.openid
              })
            }
          })
        } else {
          console.log('获取用户登录态失败！' + res.errMsg)
        }
      }
    });
  }

  // 统一下单接口获取sign（签名）
  paysignjsapi: function (appid, attach, body, mch_id, nonce_str, notify_url, openid, out_trade_no, spbill_create_ip, total_fee, trade_type, key) {
    var self = this;
    //加密签名
    wx.request({
      url: 'http://localhost:8080/XinXingWXApi/wxXcxApi/Md5Encrypt.do',
      method: 'GET',
      data: {
        appid: appid,
        attach: attach,
        body: body,
        mch_id: mch_id,
        nonce_str: nonce_str,
        notify_url: notify_url,
        openid: openid,
        out_trade_no: out_trade_no,
        spbill_create_ip: spbill_create_ip,
        total_fee: total_fee,
        trade_type: trade_type,
        key: key
      },
      //统一下单
      success: function (res) {
        var sign = res.data.strMd5
        var formData = "<xml>"
        formData += "<appid>" + appid + "</appid>" //appid