Bootstrap

按钮组件

导航条组件

导航条组件两边都留有空白，使界面美观

<nav class="navbar navbar-expand-lg navbar-light bg-light">
			<div class="container">
				<a class="navbar-brand" href="#">您好，欢迎来到牛逼书店</a>
				<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav"
				 aria-expanded="false" aria-label="Toggle navigation">
					<span class="navbar-toggler-icon"></span>
				</button>
				<div class="collapse navbar-collapse" id="navbarNav">
					<ul class="navbar-nav">
						<li class="nav-item active">
							<a class="nav-link" href="#">首页 <span class="sr-only">(current)</span></a>
						</li>
						<li class="nav-item">
							<a class="nav-link" href="#">登录</a>
						</li>
						<li class="nav-item">
							<a class="nav-link" href="#">注册</a>
						</li>
						<li class="nav-item">
							<a class="nav-link " href="#">我的购物车</a>
						</li>
					</ul>
				</div>
			</div>
		</nav>

轮播图

<div class="row" style="background-color: yellowgreen;">
						<div class="col">
							<!-- 轮播图 -->
							<div id="carouselExampleIndicators" class="carousel slide" data-ride="carousel">
								<ol class="carousel-indicators">
									<li data-target="#carouselExampleIndicators" data-slide-to="0" class="active"></li>
									<li data-target="#carouselExampleIndicators" data-slide-to="1"></li>
									<li data-target="#carouselExampleIndicators" data-slide-to="2"></li>
									<li data-target="#carouselExampleIndicators" data-slide-to="3"></li>
								</ol>
								<div class="carousel-inner">
									<div class="carousel-item active">
										<img src="img/lb1.png" class="d-block w-100" alt="...">
									</div>
									<div class="carousel-item">
										<img src="img/lb2.jpg" class="d-block w-100" alt="...">
									</div>
									<div class="carousel-item">
										<img src="img/lb3.jpg" class="d-block w-100" alt="...">
									</div>
									<div class="carousel-item">
										<img src="img/lb4.jpeg" class="d-block w-100" alt="...">
									</div>
								</div>
								<button class="carousel-control-prev" type="button" data-target="#carouselExampleIndicators" data-slide="prev">
									<span class="carousel-control-prev-icon" jaria-hidden="true"></span>
									<span class="sr-only">Previous</span>
								</button>
								<button class="carousel-control-next" type="button" data-target="#carouselExampleIndicators" data-slide="next">
									<span class="carousel-control-next-icon" aria-hidden="true"></span>
									<span class="sr-only">Next</span>
								</button>
							</div>
						</div>
					</div>

书籍分类

<div class="col-3">
					<!-- 左三为书籍分类 -->
					<div class="list-group">
						<button type="button" class="list-group-item list-group-item-action active" aria-current="true">
							书籍分类
						</button>
						<button type="button" class="list-group-item list-group-item-action">言情</button>
						<button type="button" class="list-group-item list-group-item-action">都市</button>
						<button type="button" class="list-group-item list-group-item-action">玄幻</button>
						<button type="button" class="list-group-item list-group-item-action list-group-item-danger">惊悚</button>
						<button type="button" class="list-group-item list-group-item-action">修仙</button>
						<button type="button" class="list-group-item list-group-item-action">校园</button>
						<button type="button" class="list-group-item list-group-item-action">武侠</button>
						<button type="button" class="list-group-item list-group-item-action list-group-item-dark">赘婿</button>
					</div>
				</div>