内含快乐的毕达哥拉斯分形树源代码。双击Pythagoras.html文件，程序运行；双击Pythagoras.java文件，进入编辑环境。-Pythagoras contains happy fractal source code tree. Double-click Pythagoras.html files, program run Pythagoras.java double-click the file, enter the editing environment.