EasyUI DataGrid Checkbox 多选获取选中行中的内容

<table id='grid' class='easyui-datagrid' style='width:950px;height:405px' 　　　　　　　　　　　　　　url='Ajax-index.php?module=<{$module_name}>&action=Ajax_GridView_Select&assigned_user_id=<{$assigned_user_id}>'  
    　　　　 title='列表' iconCls='icon-table' pagination='true' rownumbers='true'  toolbar='#toolbar' 　　　　　　　　　　　　　　fitColumns='false' singleSelect='false'  >  
    <thead>  
        <tr>  
            <!-- <th field='select' width='30' align='center'></th> --> 
            <th field='id' width='10' hidden='true'>编号</th>     
             
            <th data-options="field:'ck',checkbox:true"></th>
 
            <th field='name' width='130'align='center'>名称</th>   
            <th field='date_entered' width='130'align='center'>创建时间</th>   
            <th field='description' width='150' align='center'>描述</th>  
            <th field='assigned_user_name' width='130' align='center'>负责人</th>  
        </tr>  
    </thead>  
</table> 　　　　<div id='toolbar'> 
          <a href='#' class='easyui-linkbutton' iconCls='icon-add' plain='true' onclick='GetChecked()'>收款</a>
          <a href='#' class='easyui-linkbutton' iconCls='icon-cancel' plain='true' onclick='parent.TabClose();'>关闭</a>     
   </div>

<script type='text/javascript'>
         //单选 事件
      $('#grid').datagrid({
            onCheck: function(index, data) {  
                                //alert(data[0]);alert(data[1]);alert(data[2]);
                //alert(index );
                  
            }
      });
        
       //获取选中的行内容
       function GetChecked(){
        var checkedItems = $('#grid').datagrid('getChecked');
  
        var names = [];
          
        $.each(checkedItems, function(index, item){
            names.push(item.name);
        });               
        alert(names.join(","));
        //console.log(names.join(","));
    }
 
 
</script>    