typescript 泛型

继续上节课的代码 讲解泛型

class person{
    constructor(public name:string) {
        this.name =name
    }
    eat() { 
        console.log(`${this.name}吃吃吃`)
    }
}

class employee extends person {
    constructor(public code: string , name: string,) { 
        super(name)
        console.log("员工初始化")
    }

    Work() { 
        super.eat()
        this.towork()
    }
    private towork() {
        console.log(`${this.code}去工作`)
      
    }
}

var workers: Array = [];
workers[0] = new person("jack")
workers[1] = new employee("001", "jack")
workers[3] = 1

<>代表泛型  数组中指定 每一个元素 都必须是person类 

所以worker[0],worker[1]都是没问题的 因为属于person类的实例 当把数字赋值给workers的时候 就会报错 提示如下