easyui 获取cloumns字段

	var colums=datagrid.datagrid('options').columns;
									var frozens=datagrid.datagrid('options').frozenColumns;

									alert(colums[0].length+" - "+frozens[0].length);

									//拼接列头
									var heads=new Array();
									var index=0;
									//冻结列
									for(var i=0;i<frozens[0].length;i++){
										heads[index++]=frozens[0][i];
									}
									//普通列
									for(var i=0;i<colums[0].length;i++){
										heads[index++]=colums[0][i];
									}

									alert(heads);