如何在下一个js中编写设置状态和更改状态的构造函数

class StateHandler {
  constructor(initialState) {
    this.state = initialState;
  }
}

class StateHandler {
  constructor(initialState) {
    this.state = initialState;
  }

  setState(newState) {
    this.state = newState;
  }

  updateState(updateFunction) {
    this.state = updateFunction(this.state);
  }
}

const handler = new StateHandler("initial");

handler.setState("new state");
console.log(handler.state); // 输出 "new state"

handler.updateState((currentState) => currentState + " updated");
console.log(handler.state); // 输出 "new state updated"