scanCode: function() {
      var that = this;
      wx.scanCode({ //扫描微信API
        success(res) { //成功
          console.log(res) //输出回调信息
          that.setData({
            scanCodeMsg: res.result
          });
          wx.showToast({
            title: '成功',
            duration: 1000
          })
        },
        fail(res){
          wx.showToast({
            title: '失败',
            icon:'error',
            duration: 1000
          })
        },
        complete(res){
          console.log("是什么",res)
        }
      })
  },