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>
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