SOURCE

<div id="myCarousel" class="carousel slide">
	<!-- 轮播（Carousel）指标 -->
	<ol class="carousel-indicators">
		<li data-target="#myCarousel" data-slide-to="0" class="active"></li>
		<li data-target="#myCarousel" data-slide-to="1"></li>
		<li data-target="#myCarousel" data-slide-to="2"></li>
	</ol>   
	<!-- 轮播（Carousel）项目 -->
	<div class="carousel-inner">
		<div class="item active">
			<img src="http://img.lynu.cn/templates/lynu/2016/images/sliderimg/7.jpg" alt="First slide">
		</div>
		<div class="item">
			<img src="http://www.haust.edu.cn/images/17/02/18/1cla7quxs2/2016feng1.jpg" alt="Second slide">
		</div>
		<div class="item">
			<img src="http://www.lit.edu.cn/uploads/allimg/170330/4-1F3301A011F8.jpg" alt="Third slide">
		</div>
	</div>
	<!-- 轮播（Carousel）导航 -->
	<a class="carousel-control left" href="#myCarousel" 
	   data-slide="prev">&lsaquo;</a>
	<a class="carousel-control right" href="#myCarousel" 
	   data-slide="next">&rsaquo;</a>
</div>

img{background-size: cover}