//存储器： 让我们可以有效的控制对于对象的成员的访问  通过getters或者setters进行操作
(()=>{
  class Person{
    firstName: string = 'A'
    lastName: string = 'B'
    get fullName(){
      return this.firstName + '_' + this.lastName
    }
    set fullName(value){
      const names = value.split('_')
      this.firstName = names[0]
      this.lastName = names[1]
    }
  }
  const p = new Person()
  console.log(p.fullName)


  p.firstName = 'C'
  p.lastName = 'D'
  console.log(p.fullName)
  
  p.fullName = 'E_F'
  console.log(p.firstName,p.lastName)
})()