easyui dialog 自适应、底部按钮、关闭按钮、加载内容

//<div id="dlg-add"></div>
//JS代码
$('#dlg-add').dialog({
				iconCls:'icon-add',
				title:'添加',
				cache: false,  
				width:'100%',
				fit:true, //自适应浏览器大小
				closable: false, //取消右上角关闭按钮
				modal:true,
				closed: true,
				buttons:[{
					text:'保存',
					iconCls:'icon-save',
					handler:function(){alert('ok');}
				},{
					text:'取消',
					iconCls:'icon-cancel',
					handler:function(){$('#dlg-add').dialog('close');}
				}]
			});
			function add(){
				$('#dlg-add').dialog('open');
				$('#dlg-add').dialog('refresh', 'add.php');
			}