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'});  
        }  
    });