wx.login多次调用返回相同的code

小程序wx.login 多次调用返回相同的code， 时间间隔5-10秒左右

October 18th 2019, 17:28:25.892：wx.login code {“msg”:“001u1x3J1ZmKp40azi4J1XKA3J1u1x3Y”} October 18th 2019, 17:28:39.010：wx.login code {“msg”:“001u1x3J1ZmKp40azi4J1XKA3J1u1x3Y”}

October 18th 2019, 17:28:43.962： wx.login code {“msg”:“001u1x3J1ZmKp40azi4J1XKA3J1u1x3Y”}

October 18th 2019, 17:28:50.708： wx.login code {“msg”:“001u1x3J1ZmKp40azi4J1XKA3J1u1x3Y”}