Implement Pull-down menu items and form navigation bars (two menu items, a Drop-down menu, and the login form navigation bar) based on bootstrap _javascript tips

The effect diagram looks like this:

The implementation code is as follows:

<! DOCTYPE html>  

The above is a small part of the introduction of the bootstrap implementation of Drop-down menu items and form navigation bar (two menu items, a drop-down menu and login Form navigation bar), I hope to help you, if you have any questions please give me a message, small series will promptly reply to everyone. Here also thank you very much for the cloud Habitat Community website support!