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>