封装

class People {
  private name: string;
  private age: number;
  constructor(name: string, age: number) {
    this.name = name;
    this.age = age;
  }
  setName(name: string) {
    this.name = name;
  }
  getName() {
    return this.name;
  }
  setAge(age: number) {
    this.age = age;
  }
  getAge() {
    return this.age;
  }
}
const p = new People("zhangsan", 18);
p.setAge(20);
console.log(p.getAge());

这样封装，都要调用setXXX()或getXXX()方法。

为了方便，提供了一种简便的封装。但是这种方法，<font style="color:#DF2A3F;">set</font>``<font style="color:#DF2A3F;">get</font>后面的方法名不能与属性名相同。

class People {
  private _name: string;
  constructor(name: string) {
    this.name = name;
  }
  set name(name: string) {
    console.log("set name");
    this._name = name;
  }
  get name() {
    console.log("get name");
    return this._name;
  }
}
const p = new People("zhangsan");
p.name = "lisi";
console.log(p.name);