基于Xj3D开发包，针对VRML97或X3D标准。创建节点；改变节点属性值；为节点添加事件；监听节点事件；遍历模型文件中的所有节点的小例子。-Xj3D-based development kit for VRML97 or X3D standard. Create a node change the node attribute value for the node to add events monitor node events ergodic model document a sm