EL表达式中获取list长度

在jsp页面中不能通过${list.size}取列表长度，而是
<%@ taglib uri="<a target=_blank target="_blank" rel="nofollow" href="http://java.sun.com/jsp/jstl/core" style="color: rgb(51, 102, 153); text-decoration: none;">http://java.sun.com/jsp/jstl/core</a>" prefix="c"%>
<%@ taglib prefix="fn" uri="<a target=_blank target="_blank" rel="nofollow" href="http://java.sun.com/jsp/jstl/functions" style="color: rgb(51, 102, 153); text-decoration: none;">http://java.sun.com/jsp/jstl/functions</a>"%>

list的长度是：${fn:length(list)}