Question

为什么我在添加一些protected访问修饰符时出错？如果使用private，一切正常！

export interface IFighter {
    readonly _name: string;
    protected _health: number; // [ts] 'protected' modifier cannot appear on a type member.
    _power: number;
    health: () => number;
    name: () => string;
    setDamage: (damage: number) => void;
    hit: (enemy: Fighter, point: number) => void;
    knockout: () => Promise<any>;


}


export class Fighter implements IFighter { // Class 'Fighter' incorrectly implements interface 'IFighter'.
// Property '_health' is protected in type 'Fighter' but public in type 'IFighter'.
    _name: string;
     protected _health: number;
    _power: number;
  constructor(name: string, health: number, power: number) {
    this._name = name;
    this._health = health;
    this._power = power;
  }

  health(): number {
    return this._health;
  }

  name(): string {
    return this._name;
  }

  setDamage(damage: number): void {
    this._health = this._health - damage;
    console.log(`${this._name} got ${damage} dmg. ${this._health}hp less`);
  }

  hit(enemy: Fighter, point: number): void {
    let damage: number = point * this._power;
    enemy.setDamage(damage);
  }

  knockout(): Promise<any> {
    return new Promise((resolve, reject) => {
      console.log("time is over");
      setTimeout(() => {
        resolve(() => {});
      }, 500);
    });
  }
}

Answer 1

Interface的基本逻辑是像 Public Contract 或架构那样工作，因此我们可以在其他对象上使用它，同时保持一定数量的必需功能或属性。
对于您来说， IFighter 是一个接口，因此，它不能将其属性声明为受保护的。否则，它将失去使用接口的目的。
您应该从接口中删除受保护的对象，然后在类本身中声明它。

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