的FN：含有()函数确定的输入字符串是否包含指定的子串。
fn：contains()函数具有以下语法-
boolean contains(java.lang.String, java.lang.String)
以下示例说明了fn：contains()函数的功能-
<%@ taglib uri = "http://java.sun.com/jsp/jstl/core" prefix = "c" %>
<%@ taglib uri = "http://java.sun.com/jsp/jstl/functions" prefix = "fn" %>
<html>
<head>
<title>Using JSTL Functions</title>
</head>
<body>
<c:set var = "theString" value = "我是测试字符串"/>
<c:if test = "${fn:contains(theString, 'test')}">
<p>Found test string<p>
</c:if>
<c:if test = "${fn:contains(theString, 'TEST')}">
<p>Found TEST string<p>
</c:if>
</body>
</html>您将收到以下结果-
Found test string