vue, iview dynamic menu (foldable)

　　vue project and iview3 achieve dynamic collapsible menu.

　　Realize what effect menu:

1. Dynamic routing acquisition project to generate dynamic navigation menu
2. Foldable Expand
3. Automatic filter to hide the route (Example: landing)
4. First entered automatically hide all the navigation bar at the end of the phone, pc-side expansion into the navigation bar

　　demo effect