<!-- 假设项目的请求根路径是"/demo" -->
<!-- 方式一：EL表达式 -->
${pageContext.request.contextPath}
<br>显示结果："/demo"

<i:form id="AddForm" method="post" action="${pageContext.request.contextPath}/xnh/server/com/appro/CliAppro/getClicomdetailList.do" onSuccess="clicomDetail.onLoadData" 
　　onsubmit="javascript:return false">
</i:form>

<!-- 方式二：小脚本 -->
<%=request.getContextPath() %>
<br>显示结果："/demo"
<!-- 方式三：c标签 -->
<c:url value="/index.jsp"></c:url>
<br>显示结果："/demo/index.jsp"
<!-- 方式四：javascript -->
<script type="text/javascript">var baseUrl = ‘<%=request.getContextPath()%>‘;</script>
<br>显示结果：baseUrl ="/demo"