Exposing a portion of the user experience through HTML and JavaScript means that some of the experience can be served from the Web and thus be dynamic. As we saw earlier, it’s possible for this Web-served content to invoke native code in your application via a “bridge” that you create.
Apple allows JavaScript code to be downloaded and executed as long as it runs within the context of the UIWebView control in your iOS application. This is the only situation in which code “downloading” is allowed in iOS.
The UIWebView in iOS and its associated UIWebViewDelegate provide the mechanism that allows native code and JavaScript to communicate with each other.
https://github.com/ptraeg/html5-in-mobile-apps
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