jstl嵌套以及输出json的逗号

<script type="application/javascript">

    var map = {        <c:forEach items="${configFiles}" var="c" varStatus="loop">        "${c.name}": [            <c:forEach items="${c.settingsList}" var="s" varStatus="sub">            "${s.targetIP}"            <c:if test="${!sub.last}">, </c:if>            </c:forEach>        ] <c:if test="${!loop.last}">, </c:if>        </c:forEach>    }</script>