drop
英[drɒp] 美[drɑ:p]
vt.& vi. (make) drop; throw; (make) lower; reduce
vt. Give up; stop; (intentionally) lower; droop (eyes)
n. drop; airdrop; landing; a small amount
vi. (water or other liquid) drop; end; fall down (due to injury or death, etc.); exit
up
英[ʌp] 美[ʌp]
adv. On top, at a high place; get up, get up; upward; from low to high
adj. upward; rising; upright, vertical; lifted
vt.& vi .Increase; accelerate; improve; lift up, pick up
prep. at the upper end of; to a high place; to go along; to go upstream of…
n. to rise, to rise; Thrive, prosper; go uphill; (prices, etc.) rise
Bootstrap dropup style syntax
Function: Specify the drop-down menu that pops up
Bootstrap dropup style example
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Bootstrap 实例 - 下拉菜单</title> <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css"> <script src="https://cdn.bootcss.com/jquery/2.1.1/jquery.min.js"></script> <script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js"></script> </head> <body> <div class="container"> <h2>向上下拉菜单</h2> <p>.dropup 类用于指定一个向上的下拉菜单。</p> <p>.dropdown-menu 类用于创建下拉菜单。</p> <div class="dropup"> <button class="btn btn-default dropdown-toggle" type="button" id="menu1" data-toggle="dropdown">教程 <span class="caret"></span></button> <ul class="dropdown-menu" role="menu" aria-labelledby="menu1"> <li role="presentation"><a role="menuitem" tabindex="-1" href="#">HTML</a></li> <li role="presentation"><a role="menuitem" tabindex="-1" href="#">CSS</a></li> <li role="presentation"><a role="menuitem" tabindex="-1" href="#">JavaScript</a></li> <li role="presentation" class="divider"></li> <li role="presentation"><a role="menuitem" tabindex="-1" href="#">关于我们</a></li> </ul> </div> </div> </body> </html>
Click the "Run instance" button to view the online instance