触发器仿真软件，编写仿真实现4种触发器，给出当前状态和输入单个值可得到输出值，给出当前状态和输入序列可得到输出序列，可实现多个触发器的级联。-The trigger simulation software, writing simulation to achieve four kinds of triggers, given the current state and enter a single value available output value, given the current s