Please refer to the code below.
<body>
<table id="dg" class="easyui-datagrid" title="Basic DataGrid" style="width:700px;height:100%"
data-options="singleSelect:true,collapsible:true,data:data">
<thead>
<tr>
<th data-options="field:'itemid',width:80">Item ID</th>
<th data-options="field:'productid',width:100">Product</th>
<th data-options="field:'listprice',width:80,align:'right'">List Price</th>
<th data-options="field:'unitcost',width:80,align:'right'">Unit Cost</th>
<th data-options="field:'attr1',width:250">Attribute</th>
<th data-options="field:'status',width:60,align:'center'">Status</th>
</tr>
</thead>
</table>
<style type="text/css">
html,body{
height: 100%;
margin: 0;
padding: 0;
}
</style>
</body>