类

访问修饰符

默认public, 私有private, 受保护protected

class Animal {
  name: string
  // 只能当前类访问
  private food: string

  constructor(name: string, food: string) {
    this.name = name
    this.food = food
  }
  // 默认public
  eat() {
    console.log(`eat ${this.food}`)
  }
  // 只能当前类或子类访问
  protected run() {
    console.log('running')
  }
}

class Dog extends Animal {
  constructor(name: string, food: string) {
    super(name, food)
  }

  keepRun() {
    super.run()
  }
}

const dog = new Dog('wangcai', 'bone')
dog.food // error
dog.eat() // eat bone
dog.run() // error
dog.keepRun() // running

只读修饰符

class Person {
  readonly name: string = 'zhuli'
}

const p = new Person()
console.log(p.name) // zhuli
p.name = 'lisi' // error