easyui datagrid使用按钮

    $('#datagrid').datagrid({
        border:false,
        fitColumns:true,
        singleSelect: true,
        url:url,
        columns:[[
            {field:'projectname',title:'应用名',width:80},
            {field:'projectpackage',title:'应用包名',width:25}
            {field:'opt',title:'操作',width:50,align:'center',
                formatter:function(value,rec){
                    var btn = '<a class="editcls" onclick="editRow(\''+rec.projectname+'\',\''+rec.projectpackage+'\')" href="javascript:void(0)">编辑</a>';
                    return btn;
                }
            }
        ]],
        onLoadSuccess:function(data){
            $('.editcls').linkbutton({text:'编辑',plain:true,iconCls:'icon-edit'});
        }
    });