Include only the datagrid plugin.
<link rel="stylesheet" type="text/css" href="../../themes/metro/easyui.css">
<script type="text/javascript" src="../../jquery.min.js"></script>
<script type="text/javascript" src="../../jquery.easyui.min.js"></script>
<script type="text/javascript" src="http://www.jeasyui.com/easyui/plugins/jquery.datagrid.js"></script>
Or use all the files on the site.
<link rel="stylesheet" type="text/css" href="http://www.jeasyui.com/easyui/themes/metro/easyui.css">
<script type="text/javascript" src="../../jquery.min.js"></script>
<script type="text/javascript" src="http://www.jeasyui.com/easyui/jquery.easyui.min.js"></script>