easyui datagrid checkbox选中事件

$('#grid_Order').datagrid({
onCheck: function(index, data) { //alert(data[0]);
//alert(index );
$("#ChangeCore_order_id").html(data[0]);//赋值 赋安装工单id 换芯 维修 用
$("#Repair_order_id").html(data[0]);//alert($("#ChangeCore_order_id").html());
$("#order_install_id").val(data[0]);//
}
});

<table id="grid_Order" class='easyui-datagrid' style='width:1000px;' url='Ajax-index.php?module=CallIn&action=Ajax_GridView_Select_Order'
title='已购机器' iconCls='icon-table' rownumbers='true' fitColumns='false' singleSelect='true' >
<thead>
<tr>

<th data-options="field:'ck',checkbox:true"></th>

<th field='contact_name' width='80'align='center'>姓名</th>
<th field='contact_callerid' width='120'align='center' >电话号码</th>
<th field='date_entered' width='140'align='center'>创建时间</th>

<th field='contact_address' width='160' align='center' >地址</th>
<th field='description' width='160' align='center'>描述</th>
<th field='assigned_user_name' width='80' align='center'>创建人员</th>
</tr>
</thead>
</table>