TypeScript应用 极速上手（16）

1、类

注意：普通的 JOSN对象中也可以有getter和setter方法

class Employee {
   //默认为public
   // name:string
   // salary:number
   //可选参数不用初始化
    private allocatedBonus?:number
    //增加public，相当于定义了两个字段
    constructor(public name:string,public  salary:number){}

    //getter/setter
    //对使用者来说，相当于一个bonus字段
    set bonus(v:number){
        this.allocatedBonus  = v
    }

    get bonus(){
        return this.allocatedBonus || 0 //因allocatedBonus为可选字段
    }
}


//注意：普通的 JOSN对象中也可以有getter和setter方法
const  emp1 = new Employee('james',10000)
//掉用set方法
emp1.bonus  = 20000
//调用get方法
console.log(emp1.bonus)//20000 

2、类的继承

//类的继承
class Manager extends Employee {
    private reporters:Employee[]
    //此处无须public,否则成为Manager的自身属性
    constructor(name:string,salary:number){
        super(name,salary)
        this.reporters = []
    }
    addReporter(e:Employee){
        this.reporters.push(e)
    }
}

const  emp2 = new Employee('john',5000)
emp2.bonus = 10000
const manager = new Manager('mary',20000)
manager.addReporter(emp2)
manager.bonus = 50000
console.log(manager)