1-3 类

// 1. 类 class
class City {
  // 成员变量
  // cName: string = '';
  // cLevel: number = 1;
  cName: string;
  cLevel: number;
  // 构造函数
  constructor(name: string, level: number) {
    this.cName = name;
    this.cLevel = level;
  }
  // 成员方法
  about() {
    console.log(`Welcome to ${this.cName}, Level is ${this.cLevel}`);
  }
}
// 创建对象
let c1 = new City('P城', 5);
console.log(c1.cName);
c1.about();

class Person{
    name:string
    age:number
    constructor(name:string,age:number){
        this.name = name;
        this.age = age;
    }
    getName():void{
        console.log(this.name);
    }
}
var p:Person = new Person("cheng",20);
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
class Person{
    /* 实例的name */
    name:string
    age:number
    getName():void{
        console.log(this.name);
    }
}
var p:Person = new Person();
p.getName();

static

//static修饰的变量是类所共有的,只能通过类名去调用。
class 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:Person = new Person();
p.getName();