EL獲取list長度！並判斷

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>  
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions"%>   
<c:if test="${fn:length(productList) == 1}">  
  
</c:if>