Detailed explanation of the steps to obtain the ModelAndView value in js

 @RequestMapping(value="/diary")
  public ModelAndView toDiaryList(HttpSession session){
    ModelAndView view = new ModelAndView("/diary_list");
    TbUser user = (TbUser)session.getAttribute(SystemConstant.CURRENT_USER);
    //set info of current user
    if(user!=null){
      Integer id = user.getId();
      view.addObject("userId",id);
    }
    return view;
  }

<script type="text/javascript">
    var path = '<%=basePath%>';
    var author=${userId};
    $(document).ready(function(){
      queryList();
    });
    function queryList(){
      $.ajax({
        type : 'POST',
        url : path+'queryDiaryList', //通过url传递name参数
        data : {
            author:author,
            page:_currentPage,
            pageSize:_pageSize,
            type:$("#queryType").val()
          },
        dataType : 'json',
        success:function(data){
          if(data.status){
            showTable(data.result);
            //调用分页插件，初始化分页p
            pageShow("queryList",data.ext.total);
          }else{
            alert(data.description);
          }
        },
        error:function(e){
          alert("Net error ,try later.");
        }
      });
    }
    </script>

var result = eval("(" + responseText + ")");

var result = JSON.parse(responseText);

<input id="autoflag" type="hidden" value="${autoflag}">

var passflag=document.getElementById("autoflag");