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which javascript framework I should choose?

I am web developer (beginner) who wants to make cool website UIs with dinamically loading html content. I was using Jquery for simple animations and fade stuffs, but it seems that Jquery animations are not as smooth as Flash (when you have heavy webpage full of animations), and I googled "javascript frameworks". I found out that there are a lot of javascipt frameworks that allows you to create Website, similar to Desktop Application UI. It was the answer for my problems, I always wanted to create desktop like UI apps for web. But here is a problem: I found out that there are a lot of js frameworks out there. I can't choose what to learn. Can you suggest me the framework that will do the stuffs I want? 1) I want the framework to have nice UI, and also I want opportunity to design them myself, make some smooth animations too. 2) I want my website to be SEF (Search Engine Friendly) Also I have some misunderstandings about Javascript Frameworks. I know how php MVC frameworks are built, I often use CodeIgniter, and I know that Model gets data from MySql and View produces data to client (I know what Controller does). But how works Js MVC ? I can imagine what View and even Controller does, but what about model? what does model in Js in CLIENT-SIDE? And also can I use Codeigniter server-side and some other JS frameworks client side? Also I have coded in Js, but have never coded such kind of Code that these framework needs, I used them for animations only, as I mentioned above. So can you help me to choose THE Framework I need? And explain these stuffs that I can't understand?

Public Comments

1. jquery is the the best library for JavaScript. You can design your own UI and these is, write less and do more library. http://jquery.com/ Happy coding..
2. If you want to be ahead when it comes to programming for websites, I would considering looking into HTML5. Its going to be used for both websites & windows 8 applications so you will be able to create an extension of the site via an html5 app for windows for your users. Should be feasable as many sites like youtube are going to start rolling out HTML5 Versions of the site very soon. otherwise you'll mostly be sticking to jquery like said ^