EasyUI Tree树组件无限循环的解决方法

[{ 
  "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 + ']';
    }
  });