jsp页面el表达式区分操作系统

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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@ include file="/WEB-INF/tld/taglibs.jsp"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><%String userAgent = request.getHeader("User-Agent");String deviceOS = "";if(userAgent.indexOf("Android")>0 || userAgent.indexOf("iPhone")>0){deviceOS = "phone";} %><title>开机启动</title></head><body><%= userAgent%><%= deviceOS%><center><c:if test='<%=deviceOS == "phone" %>'><img alt="" src="${img}"  width="80%"/></c:if><c:if test='<%=deviceOS == "" %>'><img alt="" src="${img}" /></c:if></center> </body></html>



注意el表达式中的双引号 '<%= deviceOS == "phone" %>'

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