第一种：

toolbar:'#tb'


<div id="tb" style="height:auto">
        <a href="javascript:void(0)" class="easyui-linkbutton" data-options="iconCls:'icon-add',plain:true" onclick="accept()">添加</a>
        <a href="javascript:void(0)" class="easyui-linkbutton" data-options="iconCls:'icon-undo',plain:true" onclick="reject()">Reject</a>
        <a href="javascript:void(0)" class="easyui-linkbutton" data-options="iconCls:'icon-search',plain:true" onclick="getChanges()">查找</a>
</div> 

第二种：

$('#dg').datagrid({
    toolbar: [{
        iconCls: 'icon-edit',
        handler: function(){alert('编辑按钮')}
    },'-',{
        iconCls: 'icon-help',
        handler: function(){alert('帮助按钮')}
    }]
});