写在html<head>标签里面， 复制代码代码如下:<style type="text/css"> .x-tree-node-collapsed .x-tree-node-icon { background:transparent url(web/css/images/default/tree/1.gif); } .x-tree-node-expanded .x-tree-node-icon { background:transparent url(web/css/images/default/tree/drop-no.gif); } .x-tree-node-leaf .x-tree-node-icon{ background:transparent url(web/css/images/default/tree/2.gif); } </style> 原...