Bootstrap CSS Component button pull-down menu _javascript Tips

Button drop down menu

Combined with. Btn-group (BTN-GROUP-LG/BTN-GROUP-SM/BTN-GROUP-XS). Dropup btn. Dropdown-menu
The button Pull-down menu is encapsulated on the basis of an ordinary Pull-down menu. The BTN style has an effect, similar to clicking a button button and then displaying a hidden drop-down menu.

Combo drop down Menu
Detached pull-down Menu
Drop-down menu with Bounce up

source code, CSS Implementation mode is mainly set. The bottom of the Dropdown-menu style container is 100%
. Dropup dropdown-menu,. Navbar-fixed-bottom. Dropdown.
Dropdown-menu {
 top:auto;//height adaptive
 bottom:100%;//distance dropup Style The width of the element at the bottom 100%, that is, by the top border, pop-up
 margin-bottom up: 2px;
}

<! DOCTYPE html>  

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