{       "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          },{               "id": 8,               "text":"Sub Bookds",               "state":"closed"          }]       }]   }

红色处修改树形结点的图标