相关疑难解决方法(0)

#refundReasonMenu #nav li:last-child {
    border-bottom: 1px solid #b5b5b5;
}

<div id="refundReasonMenu">
    	<ul id="nav">
    		<li><a id="abc" href="#">abcde</a></li>
    		<li><a id="def" href="#">xyz</a></li>
    	</ul>
    </div>