6.抽象类
<p>常规类：</p>
<pre><code>class Person {
name: string
age: number
constructor(name:string,age:number){
this.name = name
this.age = age
}
}
const p1 = new Person('张三',18)
const p2 = new Person('李四',19)
console.log(p1)
console.log(p2)</code></pre>
<p>继承：</p>
<pre><code>// Person类
class Person { }
// Teacher类继承Person
class Teacher extends Person { }
// Student类继承Person
class Student extends Person { }
// Person实例
const p1 = new Person('周杰伦',38)
// Student实例
const s1 = new Student('张同学',18)
const s2 = new Student('李同学',20)
// Teacher实例
const t1 = new Teacher('刘⽼师',40)
const t2 = new Teacher('孙⽼师',50)</code></pre>
<p>抽象类：不能去实例化，但可以被别⼈继承，抽象类⾥有抽象⽅法</p>
<pre><code>// Person（抽象类）
abstract class Person { }
// Teacher类继承Person
class Teacher extends Person {
// 构造器
constructor(name: string,age: number){
super(name,age)
}
// ⽅法
speak(){
console.log('你好！我是⽼师:',this.name)
}
}
// Student类继承Person
class Student extends Person { }
// Person实例
// const p1 = new Person('周杰伦',38) // 由于Person是抽象类，所以此处不可以new Perso
n的实例对象</code></pre>