8 修饰符

public  private  protected

class Person{
    // 使用private修饰的变量在类外部是不可读取的
    private name:string = "lisi";
    public age:number = 20;
}
var p:Person= new Person();
console.log(p);
console.log(p.age);
p.age = 30;
console.log(p);

protected 修饰的变量在类外部不能访问
class Student{
    protected name:string = "lisi"
    sayName(){
        console.log(this.name);
    }
}
var s:Student = new Student();
// console.log(s.name);

private protected区别

protected在子类中protected可以访问，private不可访问

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