Why does the JavaScript class indicate that the function is not a function, but this only happens when accessing it on a mobile device?

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There could be several reasons why a JavaScript class function is indicating that it's not a function only on a mobile device. Some possible reasons are:

1. Compatibility Issues: There may be compatibility issues between the mobile device's browser and the JavaScript code. Some browsers may not support all of the JavaScript features, leading to unexpected errors.

2. Syntax Errors: The code may contain syntax errors that are not being caught on desktop devices but are causing problems on mobile devices. This could happen if the code relies on certain assumptions about the browser's behavior or environment that are not valid on a mobile device.

3. Network Issues: It's possible that the mobile device is experiencing network issues or slower internet speeds, which may be causing the code to not be loaded or executed properly. This could also cause unexpected behavior and errors.

To determine the exact cause of the problem, it's important to debug the code on the mobile device browser and investigate any errors that are being reported.