easyui如何获得checkbox下选中的项

Question

 <div id="top_country" >
                                    <div id="selected_country" style="border: 1px solid #E2F0F9;width:100%;height:200px;"> 
                                        <table id="dg"  class="easyui-datagrid"  style="font-size:10px;height: 200px;"
                                          url="<%=basePath%>region/queryallCountry" rownumbers="true" fitColumns="true">
                                            <thead> 
                                                <tr> 
                                                    <th hidden="true" field="uuid" width="100px">uuid</th>  
                                                    <th field="ck" checkbox=true></th>
                                                    <th field="countryname" width="100px"  halign="center">国家列表</th>  

                                                </tr> 
                                            </thead> 
                                            <tbody>
                                            </tbody>
                                        </table>
                                    </div>
                                </div>![图片说明](https://img-ask.csdn.net/upload/201801/18/1516242896_612248.jpg)

                                想把选中的项append到右边