1. Check whether the client environment is properly configured, such as the mobile platform (iOS or Android), the environment in which your app is deployed (development, staging, or production), the network (internal network or Internet), and the web protocol (HTTP or HTTPS). If an HTTPS page cannot be opened, the HTTPS certificate may not be installed. Try again after you install the HTTPS certificate.
2. Check whether a JavaScript error exists.
3. If you find that a feature does not work, especially in an old version of iOS, check whether this feature is supported in earlier versions of iOS and whether special extensions (such as extensions prefixed with -webkit-) are required.
4. If the issue may be related to JSBridge, perform the following steps:
   1. 1. Check whether JSBridge has invoked a success callback, a failure callback, or no callback.
      2. If JSBridge has invoked a success callback, check whether the callback content is in line with expectations.