dtree 中循环菜单，获取图片

现在我的菜单是封装在一个xml文件的，dtree 中循环菜单，不同的菜单用不同的小图片，
dtree.add 方法该加哪些参数？ 还是说用其他的方法

不是有个icon参数，配置这个icon就行了

 Functions

add()

Adds a node to the tree.
Can only be called before the tree is drawn.

id, pid and name are required.

Parameters

Name    Type    Description
id  Number  Unique identity number.
pid Number  Number refering to the parent node. The value for the root node has to be -1.
name    String  Text label for the node.
url String  Url for the node.
title   String  Title for the node.
target  String  Target for the node.
icon    String  Image file to use as the icon. Uses default if not specified.
iconOpen    String  Image file to use as the open icon. Uses default if not specified.
open    Boolean Is the node open.