1- 类

  1. class Person{
  2.     name:string
  3.     age:number
  4.     constructor(name:string,age:number){
  5.         this.name = name;
  6.         this.age = age;
  7.     }
  8.     getName():void{
  9.         console.log(this.name);
  10.     }
  11. }
  12. var p:Person = new Person("cheng",20);
  13. p.getName();
  1. class Person{
  2.     /* 实例的name */
  3.     name:string
  4.     age:number
  5.     getName():void{
  6.         console.log(this.name);
  7.     }
  8. }
  9. var p:Person = new Person();
  10. p.getName();  // undefined
  11. //当没有构造函数的时候,代码底层有自动补全构造函数

2- static

  1. //static修饰的变量是类所共有的,只能通过类名去调用。
  2. class Person{
  3.     /* 实例的name */
  4.     static skill:string = "js";
  5.     name:string
  6.     age:number
  7.     getName():void{
  8.         console.log(Person.skill)
  9.         console.log(this.name);
  11.     }
  12. }
  13. var p:Person = new Person();
  14. p.getName();  // js  undefined