请问bootstrap如何传参，为什么recipient明明有值得，却判空呢？

Question

<script>
    $('#exampleModal').on('show.bs.modal', function (event) {
        var button = $(event.relatedTarget) 
        var recipient = button.data('whatever') 
        var modal = $(this)
        modal.find(".modal-title").text(recipient);
        <c:forEach items = "${splist}" var="a">
                    <c:if test = "${a.spid eq recipient}">
                      modal.find('.modal-body input').val("${a.kcsl}")
                    </c:if>
        </c:forEach>
    })
</script>