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>