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c:foreach 循环固定次数
<c:forEach var="i" begin="0" end="${days-1}">
<div id="section-${i+1}">
<c:choose>
<c:when test="${not empty idList[i]}"> <!-- idList是List类型变量 -->
<iframe name="dayIframe${i+1}" frameborder="0" scrolling="no" width="100%" height="700" src="${ctx}/ticket/scheduling/packageScheduling/schedulingIframe?packageId=${packageId}&day=${i+1}&id=${idList[i]}"></iframe>
</c:when>
<c:otherwise>
<iframe name="dayIframe${i+1}" frameborder="0" scrolling="no" width="100%" height="700" src="${ctx}/ticket/scheduling/packageScheduling/schedulingIframe?packageId=${packageId}&day=${i+1}"></iframe>
</c:otherwise>
</c:choose>
</div>
</c:forEach>