<li class="poster-item"><a href="#"><img src="1.jpg" width="100%" height="100%"></a></li>
<li class="poster-item"><a href="#"><img src="2.jpg" width="100%" height="100%"></a></li>
<li class="poster-item"><a href="#"><img src="3.jpg" width="100%" height="100%"></a></li>
下面有关于奇数张的解决