自定义下拉框

 <div class="select-box">
	<span class="select-value" id ="patrolId" >请选择</span>
	<a class="select-img select-close"></a>
	<div class="option fence">
	    <a>请选择</a>
	</div>
</div>　　 <div class="select-box">
	<span c