css hover对其包含的元素进行样式设置

<ul class="icon-down-single-arr-li">
	<li>        
		<a href="javascript:void(0)">价格<span class="icon-all icon-down-single-arr"></span></a>      
	</li>
</ul>

.icon-down-single-arr{
	background-position: -67px -974px;
}
.icon-down-single-arr-li li:hover .icon-down-single-arr{
	background-position: -81px -974px;
}