非常好的一篇文章：
http://webdesigntutsplus.s3.amazonaws.com/tuts/312_bs/My-Bootstrap-Site-NAVBAR/navbar-examples.html
特别注意的是
Static Navbar Full-Width：
Notes & Code
To make a navbar that's positioned static within a page, yet still full-width:
- Remove class "navbar-fixed-top" from div class "navbar".
- Customize the styles on div class "navbar-inner" to remove rounded corners
- It depends ...
- If you're using Bootstrap 2.02 -->you'll need to modify a line in bootstrap.css. (See code example.)
- If you're using Bootstrap 2.0 or 2.01 --> you should be good to go!
改变navbar color:
重写.navbar-inner:
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