JSP页面显示问题 - 编程论坛

JSP小白一枚，请教各位大神如下所示的页面中为什么会有那个小箭头？

程序代码：

<%@ page language="java" import="java.util.*,model.Entt, model.entts.*" pageEncoding="utf-8"%>

<%@ taglib uri="/WEB-INF/tld/page.tld" prefix="p"%>
<%@ taglib prefix="c" uri="http://java. taglib prefix="fn" uri="http://java. taglib prefix="fmt" uri="http://java. HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <title>用户管理 </title>

    

    <meta http-equiv="cache-control" content="no-cache">

    <meta http-equiv="expires" content="0">

    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

    <meta http-equiv="description" content="This is my page">

    <link rel="stylesheet" type="text/css" href="<%=request.getContextPath() %>/js/easyui/themes/default/easyui.css"/>
    <link rel="stylesheet" type="text/css" href="<%=request.getContextPath() %>/js/easyui/themes/icon.css"/>
    <link rel="stylesheet" type="text/css" href="<%=request.getContextPath() %>/js/easyui/demo.css"/>
    <script type="text/javascript" src="<%=request.getContextPath() %>/js/easyui/jquery.min.js"></script>
    <script type="text/javascript" src="<%=request.getContextPath() %>/js/easyui/jquery.easyui.min.js"></script>
    <script type="text/javascript">


        function queryUser(vpageNumber,vpageSize){
            $('#form_entt_list').form('submit',
               {
                onSubmit: function(param){
                         param.pageNumber = vpageNumber;
                         param.pageSize = vpageSize;
                         param.jsonOperationType = 'loadJsonList';
                         return $(this).form('enableValidation').form('validate');
                       },
                    success:function(data){
//                        data = eval('(' + data + ')');

                       data = $.parseJSON(data);
                       $('#zdglListGrid').treegrid('loadData',{"total" : data.total,"rows" : data.rows});

                       var pager = $('#zdglListGrid').treegrid('getPager');
                    $(pager).pagination({

                        pageNumber:vpageNumber,
                        pageSize:vpageSize,
                        total:data.total,
                        beforePageText: '第',//页数文本框前显示的汉字

                        afterPageText: '页    共 {pages} 页',
                        displayMsg: '共{total}条数据',

                        onBeforeRefresh: function(){

                        },

                            onSelectPage: function (pageNumber, pageSize){//分页触发

                            queryUser(pageNumber,pageSize);

                        }

                    });

                }
            });

        }


        function onContextMenu(e,row){
            e.preventDefault();
            $(this).treegrid("select",row.id);
            $('#mm').menu('show',
            {
                left: e.pageX,
                top: e.pageY
            });
        }


        function onAdd(){
            location.href="<%=request.getContextPath()%>/userEditService?enttname=HtUser";
        }


        
        $(document).ready(function(){
            $('#zdglListGrid').width(document.body.clientWidth);
            $('#zdglListGrid').height(document.body.clientHeight);

            
            $('#zdglListGrid').treegrid({

                             pagination:true,
                             pageList:[5,10,15],
                             pageSize:5,
                             pageNumber:1,
                             striped:true,
                             rownumbers:false,
                             singleSelect:true,
                             loadMsg:'请稍等，数据加载中...',
                             method:'post',
                             idField: 'id',
                             treeField: 'projectname',
                             toolbar:'#zdglToolbar',
                             onContextMenu:onContextMenu,
                             onLoadSuccess:function(data){
                             },
                             onDblClickRow:function(index,row){
                             }
            });
            queryUser(vpageNumber,vpageSize);
        });

    </script>

</head>

    <body>
        <c:forEach var="r" items="${context_entt_e_xt_yong_hu.roleIds}">
                 <c:if test="${r eq '4'}">
                    <c:set var="statusFlag" value="1"></c:set>
                 </c:if>
                 <c:if test="${r eq '1' or r eq '8'}">
                    <c:set var="statusFlag" value="2"></c:set>
                 </c:if>
                 <c:if test="${r eq '2' or r eq '3'}">
                    <c:set var="statusFlag" value="3"></c:set>
                 </c:if>
                 <c:if test="${r eq '6' or r eq '7'}">
                    <c:set var="statusFlag" value="4"></c:set>
                 </c:if>
        </c:forEach>



        <table id="zdglListGrid" title="用户管理" class="easyui-treegrid" toolbar="#toolbar" style="width:800px;height:400px"
            fitColumns="true",singleSelect="true",fit="true",pagination="true">
                 <thead>
                    <tr>
                        <th data-options="field:'id',align:'center',resizable:false,hidden:true" width=0px>id</th>
                          <th data-options="field:'username',align:'center',resizable:true" width=100px>用户名称</th>
                          <th data-options="field:'realname',align:'center',resizable:true" width=300px>单位名称</th>
                          <th data-options="field:'roleChinese',align:'center',resizable:true" width=100px>用户角色</th>
                      </tr>
                  </thead>

         </table>


         <div id="mm" class="easyui-menu">
             <div onclick="append()" data-options="iconCls:'icon-add'">增加</div>
             <div onclick="remove()" data-options="iconCls:'icon-remove'">删除</div>
         </div>


         <div id="toolbar">

              <form id="form_entt_list"

                     name="form_entt_list"

                  action="showuserListService?enttname=HtUser&oper=query"

                  method="post">

                <div>
                    用户名
                    <input class="easyui-textbox" name="input_query_projectname" style="width:200px" type="text" id="id_input_query_projectname"   />   
                    单位名称
                    <input class="easyui-textbox" name="input_query_projectname" style="width:250px" type="text" id="id_input_query_projectname"   />   
                    用户角色
                    <select id="userRole" name="ur" class="easyui-combobox" panelHeight="auto" style="width: 80px">
                        <option value="">请选择</option>
                        <option value="管理员">管理员</option>
                        <option value="区领导">区领导</option>
                        <option value="监管者">监管者</option>
                        <option value="建设者">建设者</option>
                        <option value="代建者">代建者</option>
                        <option value="责任人">责任人</option>
                    </select>   

                    <c:if test="${statusFlag eq '1'}">


                    </c:if>


                    </br></br>


                    <a href="#" class="easyui-linkbutton" iconCls="icon-search" onclick="queryUser(1,5)">查询</a>
                    <a href="#" class="easyui-linkbutton" iconCls="icon-scan" onclick="scan">浏览...</a>
                    <a href="#" class="easyui-linkbutton" onclick="importFile()">导入</a>
                    <a href="#" class="easyui-linkbutton" iconCls="icon-add" onclick="onAdd()">新增</a>
                </div>


            </form>
          <a href="#" class="easyui-linkbutton" iconCls="icon-tip"  plain="true">提示：鼠标左键单击选择列表中项目，右击弹出操作菜单进行操作</a>
        </div>
    </body>

</html>

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代码如下：