js 实现状态机

class StateMachine {
  constructor(initialState, transitions) {
    this.currentState = initialState;
    this.transitions = transitions;
  }

  transition(event) {
    const nextState = this.transitions[this.currentState]?.[event];
    if (nextState) {
      this.currentState = nextState;
      console.log(`Transitioned from ${this.currentState}`);
    } else {
      console.log(`Invalid transition from ${this.currentState} with event ${event}`);
    }
  }
}

// 定义状态和转换
const transitions = {
  idle: { start: 'running' },
  running: { stop: 'idle', pause: 'paused' },
  paused: { resume: 'running', stop: 'idle' }
};

// 创建状态机实例
const sm = new StateMachine('idle', transitions);

// 触发状态转换
sm.transition('start'); // Transitioned from idle
sm.transition('pause'); // Transitioned from running
sm.transition('resume'); // Transitioned from paused
sm.transition('invalidEvent'); // Invalid transition from running with event invalidEvent