Everyone has considered what to say as well as how to behave during the interview.
To be honest, it's not as stunning as it may seem. Needless to say every employer may demand from us experience about other field of expertise. The capability to work in group, the necessity to always be up to speed with newest changes and improvements, and a great many other demands - this is one way the life span of java scripter looks like.
This is why most of us should know very well what the expectations in our future employer are and whether we are capable of fulfilling them. There, you will find what features are most wanted by employers and how to behave in order to meet up with the requirements for the job!
Although you feel pretty self-confident and you know that you have got enough knowledge to be a great staff member, your approach towards the job or even how you act may be enough reason for the interviewer to send you off. A lot of people feel that once your CV is accepted, you will instantly find yourself in the job and enjoy its wonderful benefits and advantages.