Exception occurred during the use of WeChat JS-SDK. Exception in obtaining JS signature due to expired signature, invalid permission or abnormal network. It is necessary to further investigate the specific reasons for the anomaly of obtaining JS signature, and then solve the problem in a targeted manner. Exception in obtaining JS signature generally refers to an exception when the config interface of JS-SDK is suitable for permission verification for some reason, which will cause the page to fail to call the API interface of WeChat normally. Wechat is a cross-platform communication tool. Support single and multi-person participation, and send voice, pictures, videos and texts through the mobile phone network.