easyui tree树组件无限循环

在学习jquery easyui的tree组件的时候，在url为链接地址的时，发现如果最后一个节点的state为closed时，未节点显示为文件夹，单击会重新加载动态(Url:链接地址）形成无限循环。如：

tree.json

[{  
    "id":1,  
    "text":"Folder1",  
    "iconCls":"icon-save",  
    "children":[{  
        "text":"File1",  
        "checked":true  
    },{  
        "text":"Books",  
        "state":"open",  
        "attributes":{  
            "url":"/demo/book/abc",  
            "price":100  
        },  
        "children":[{  
            "text":"PhotoShop",  
            "checked":true,
            "state":"closed"            
        },{  
            "id": 8,  
            "text":"Sub Bookds",  
            "state":"open"  
        }]  
    }]  
}] 

$('#box').tree({
        url :"tree.json",
        cascadeCheck : false,
        onlyLeafCheck : true,
        lines : true,
        formatter : function (node) {
            return '[' + node.text + ']';
        }
    });

• tree组件无限循环截图
  

解决方法：把末节点State状态设为open可正常显示