13.变量修饰符

2.private

class Preson{
    private name:String="list"
    public age:number=20
}
var p:Preson=new Preson();
console.log(p);

private不可以访问

class Student{
    private  name:string="list"
    sayName():void{
        console.log(this.name);
    }
}
class MidStudent extends Student{
    getName(){
        console.log(this.name);
    }
}
var m:MidStudent=new MidStudent();
m.getName();

3.protected

声明在类外部不可以访问

class Student{
    protected  name:string="list"
    sayName():void{
        console.log(this.name);
    }
}
var s:Student =new Student();
console.log(s.sayName());

protected可以访问

class Student{
    protected  name:string="list"
    sayName():void{
        console.log(this.name);
    }
}
class MidStudent extends Student{
    getName(){
        console.log(this.name);
    }
}
var m:MidStudent=new MidStudent();
m.getName();