调试易

用下面那个json，展现树，节点展开时，会死循环，子节点展开后，又是这棵树，然后可以无穷展开，到最后浏览器崩溃。
后来实验发现，只有把节点的 "iconCls":"icon-phonebook", 去掉。才能正常显示。"state":"closed"属性指定，也是这个问题。有碰到这个问题的朋友么？[{
"id":"01",
"text":"System Manager",
"state":"closed",
"children":[{
"id":"02",
"text":"User Auth Manager",
"iconCls":"icon-phonebook",
"state":"opened",
"children":[{
"id":"003",
"text":"Menu Manager",
"state":"closed"},
{
"id":"004",
"text":"Role Manager",
"state":"closed"},
{
"id":"005",
"text":"User Manager",
"state":"closed"},
{
"id":"006",
"text":"User Au manager",
"state":"closed"}]},
{
"id":"07",
"text":"Dept All Manager",
"iconCls":"icon-phonebook",
"state":"opened",
"children":[{
"id":"008",
"text":"Dept Manager",
"state":"closed"},
{
"id":"009",
"text":"Job Manager",
"state":"closed"},
{
"id":"010",
"text":"Title Manager",
"state":"closed"}]}]
}]