<table id="dg" title="学生信息" class="easyui-datagrid" 
      url="${ctx}listStudent.do" 
      toolbar="#toolbar" pagination="true" 
      rownumbers="false" fitColumns="true" singleSelect="true"> 
    <thead> 
      <tr> 
        <th data-options="field:'stuNo',sortable:true,width:20">学号</th> 
        <th data-options="field:'name',width:20">姓名</th> 
        <th data-options="field:'gender',width:20,formatter:formatGender">性别</th> 
        <th data-options="field:'nationality',width:20">名族</th> 
        <th data-options="field:'address',width:50,formatter:formatAddr">家庭地址</th> 
        <th data-options="field:'mobile',width:20">手机号</th> 
        <th data-options="field:'birthday',width:20">出生日期</th> 
        <th data-options="field:'registDate',sortable:true,width:20">入学时间</th> 
        <th data-options="field:'_operate',width:80,align:'center',formatter:formatOper">操作</th> 
      </tr> 
    </thead> 
  </table> 
<th data-options="field:'_operate',width:80,align:'center',formatter:formatOper">操作</th>

function formatOper(val,row,index){ 
  return '<a href="#" rel="external nofollow" onclick="editUser('+index+')">修改</a>'; 
} 

function editUser(index){ 
  $('#dg').datagrid('selectRow',index);// 关键在这里 
  var row = $('#dg').datagrid('getSelected'); 
  if (row){ 
    $('#dlg').dialog('open').dialog('setTitle','修改学生信息'); 
    $('#fm').form('load',row); 
    url = '${ctx}updateStudent.do?id='+row.id; 
  } 
} 

selectRow index Select a row, the row index start with 0.

$('#dg').datagrid('selectRow',index);
var row = $('#dg').datagrid('getSelected');