2. 类

calss Person{
  name:string
  age:number
  constructor(name:string,age:number){
    this.name = name;
    this.age = age;
  }
  getName():void{
    console.log(this.name)
  }
}
var p = new Person("li",15);
p.getName();

calss Person{
  //实例的name
  name:string
  age:number
  getName():void{
    console.log(this.name)
  }
}
var p = new Person();
p.getName();
//当没有构造函数的时候，代码底层有自动补全构造函数

1. static

//static修饰的变量是类所共有的，只能通过类名去调用
calss Person{
  //实例的name
  static skill:string = "js";
  name:string
  age:number
  getName():void{
    console.log(Person.skill)
    console.log(this.name)
  }
}
var p = new Person();
p.getName();