HTML Question

Bootstrap doesn`t work without internet

I begin to use Bootstrap. And I add "js/bootstrap.min.css"
to my index.html and all works. But, when I add bootstrap.min.js to index.html ,my, for example, dropdown menu doesn`t work. But, when I add" - my dropdown menu works.
I want to work with menu without connecting to Internet.


Bootstrap uses jquery, since your need to use it without internet download the jquery file and put it inside JS folder and serve it to index.html