问题
I'm have a bootstrap's navbar in my page.
How can I make a navbar that will never warp the icons, but will add them one by one into a sub-menu in a button. (And if possible - to make the symbols be removed from left to right, meaning that the first symbol to disappear will be the one to the furthest to the left)
来源：https://stackoverflow.com/questions/31696225/collapse-bootstraps-navbar-symbols-to-menu-one-by-one