js中EL表达式使用(jsp中)
比如访问servlet set (request.setAttribute("xxx", "yy");
request.getRequestDispatcher("/2.jsp").forward(request, response))，然后跳转到http://localhost:8080/day05/set?name=Tom&age=30
然后可以通过以下代码获取相关数据，其实明白jsp翻译成的servlet代码，就会了然。JspWriter out = pageContext.getout()。out.write("<script >");

<script type="text/javascript">    alert('${requestScope.xxx}');    alert('${xxx}');    alert('${param.age}');    alert('http://' + '${pageContext.request.serverName}' + ':' + '${pageContext.request.serverPort}' + '${pageContext.request.contextPath}' + '${pageContext.request.servletPath}');    </script>