HSM

代码说明：

  本历程实现了一个完整的层次状态机HSM，可根据UML方便的写出相应的状态机代码。特别适合复杂状态机的开发。(This process implements a complete hierarchical state machine (HSM), according to the UML state diagram convenient to write the corresponding state machine code. Especially for complex state machine development.)