js方法
function zan(st){
			var uid = document.getElementById("uid_"+st);
			alert(uid);
			var aid = document.getElementById("aid_"+st);
			alert(aid);
		
		}

c:foreach
<pre name="code" class="html">

<c:forEach items="${question.answers }" var="answer" varStatus="st">
				<div class="answer">
					<!--使用者欄-->
					<div class="user">
						<img src="${pageContext.request.contextPath}/${answer.user.image}" alt="#" id="question_detail-commentUserImg"/>
						<span style="color: #28A1CF;" id="question_detail-commentUserName">${answer.user.username }</span>
						<span style="float: right;line-height: 3em; color: #737373;" id="question_detail-commentUserTime"><fmt:formatDate pattern="yyyy-MM-dd " value="${answer.atime }" /></span>
						
						<input type="hidden" id="uid_${st.index }" value="${answer.user.uid}"> 
 

<a href="javascript:zan(${st.index });" style="color: #28A1CF; float: right; margin-right: 20px;">支援(${answer.goodCount})</a>