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Announcement:
The Xamarin Forums have officially moved to the new Microsoft Q&A experience. Microsoft Q&A is the home for technical questions and answers at across all products at Microsoft now including Xamarin!To create new threads and ask questions head over to Microsoft Q&A for .NET and get involved today.
Posts
To understand which languages can be used to develop with Xamarin, see https://docs.microsoft.com/en-us/xamarin/cross-platform/platform/
Regarding using Razor templates (if that is of interest), see https://docs.microsoft.com/en-us/xamarin/cross-platform/platform/razor-html-templates/
Have you read the two pages that I linked to in my post above? If so, you will have seen that you can use C#, F# or VB.Net to develop with Xamarin. If you want to use JavaScript (which is what I assume you mean by Java script), you can do so inside a web view that is part of a Xamarin app, and can use Razor templates. There are code snippets on the second page that show the basics of how to do this.
If you need a Getting Started guide to Xamarin, see https://docs.microsoft.com/en-us/xamarin/get-started/
You haven't said whether by Xamarin you mean Xamarin.Forms, or whether you mean Xamarin iOS and Xamarin Android. For the differences, see https://docs.microsoft.com/en-us/xamarin/ . If you have decided which it is, there are plenty of samples available online that show how to use web views and JavaScript from Xamarin - your favorite search engine should find them easily enough.