I really spent a lot of time trying to understand Javascript. Now, from this perspective, I can tell that it is not possible without knowing it's background and how Javascript is related to other languages. For example, to know prototype nature of language, you have to know basic things about classes and that type of object-oriented approach. One great text, that clarifies that can be found on Mozila developer site:
https://developer.mozilla.org/en-US/docs/JavaScript/Guide/Details_of_the_Object_Model?redirectlocale=en-US&redirectslug=Core_JavaScript_1.5_Guide%2FDetails_of_the_Object_Model#Class-Based_vs._Prototype-Based_Languages
Happy coding
