javascript 如何访问 action或者controller 传给 jsp 页面的值

<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>
<%@ page import="com.alibaba.fastjson.JSONObject"%>

<%
    JSONObject jo = null;
    String openid = null;
    if(request.getSession().getAttribute("openidAndAccessToken") != null){
        jo = (JSONObject)request.getSession().getAttribute("openidAndAccessToken");
        if(jo != null)
            openid = jo.getString("openid");
    }
    
    String accessToken = null;
    if(request.getAttribute("access_token") != null){
        accessToken = request.getAttribute("access_token");
    }
%>

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title><%=openid %></title>
<script type="text/javascript">
var openid = "<%=openid %>";
var accessToken = "<%=accessToken %>";

....
</script>
</head>
<body>
<p>openid:<%=openid %></p>
<p>openid:<%=accessToken %></p>
</body>
</html>

如上述代码所示，js访问 jsp 页面的值，需要使用双引号：var openid = "<%=openid %>"

而在页面显示则不需要使用引号：<p>openid:<%=openid %></p>