i know some about java script and i want to learn complete java script .friends tell me the best book to easy learn js. and time duration to spend on it
there are some advanced tutorials for javascript out there just like here.. http://www.openjs.com/tutorials/advanced_tutorial/ but the best way to really learn it completely it through experience by handling real scripts from live websites..
I don't thnk that I can post links yet. Gooogle "freebookspot", it is under a Spanish domain. Then look for title "javascript", it gives you 10 pages of results of nice ebooks I like "Javascript&Jquery - the missing manual"
Nobody ever needs to know "complete" javascript. Learn what you need to get the job done as and when you need it. If its a paying job then the clock stops while you "learn" but its pointless learning it all. For instance, AJAX is written in javascript. I use it all the time, I rely on it. However I couldn't not code a javascript library and my clients don't require me to. They are happy to use prototype or jquery and know that it is robust, secure and free. Why pay me to recreate the wheel? I do, however, know how to scan the code, debug and test. That they do find useful. So find the limits of what is really needed and learn that.
Learning programming is probably the best first step, though. Knowing a programming language (scripting is programming) without knowing programming is like "knowing books" without being able to read. You have the tool, but no ability to use it.