HTML:

<div class="easyui-layout" style="min-height:100%;min-width:100%;">
<div id="gridData" class="region:'center',easyui-datagrid" ></div>
</div>

JS:

$("#datagrid").datagrid({
            fit: true,
            fitColumns: true,
            striped: true,
            border: 
 
false,
            rownumbers: true,
            pagination: true,
            toolbar: "#toolbarid",
            columns: [columns],
        })