breautek commented on issue #1263:
URL: https://github.com/apache/cordova-ios/issues/1263#issuecomment-1260878594

   > When I inject js in iOS, there will be some errors, how should I inject 
custom js?
   
   You should load up JS using traditional means, such as a `<script>` tag.
   
   Alternatively, you can use the standard 
[Function](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function)
 constructor, which will create a function with the scope of the global object, 
but this isn't the recommended approach due to similar issues (although less 
severe) to the standard 
[eval](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/eval)
 function. 
[MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/eval#never_use_eval!)
 writes about the bad practices behind both `eval` and the `Function` 
constructor.
   
   If you're authoring a Cordova plugin, then refer to the [iOS plugin 
documentation](https://cordova.apache.org/docs/en/11.x/guide/platforms/ios/plugin.html).
 It contains 
[examples](https://cordova.apache.org/docs/en/11.x/guide/platforms/ios/plugin.html#echo-ios-plugin-example)
 of how to do cross communication between the native and javascript 
environments. Generally speaking, the application should respond to data with 
an appropriate, predefined function instead relying on the `eval` solution, 
which will likely introduce a security risk into your app.


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