bootstrap achieve the drop-down box

bootstrap is a very easy to use ui preceding frame, to praise one!

To achieve the drop-down box

<ul class="nav nav-pills">
			<li class="dropdown all-camera-dropdown"><a
				class="dropdown-toggle" data-toggle="dropdown" href="#">
					-请选择- <b class="caret"></b> </a>
					<ul class="dropdown-menu">
					<li data-filter-camera-type="all"><a
							data-toggle="tab" href="#">HTML5</a>
					</li>
					<li data-filter-camera-type="Alpha"><a
									data-toggle="tab" href="#">PHP</a>
					</li>
					<li data-filter-camera-type="Zed"><a
								data-toggle="tab" href="#">MySQL</a>
					</li>
					<li data-filter-camera-type="Bravo"><a
								data-toggle="tab" href="#">JavaScript</a>
					</li>
					</ul>
				</li>
			</ul>

From: https://www.runoob.com/bootstrap/bootstrap-dropdowns.html