1-10 修饰符

1. public/private/protected

class Persons{
    /* 1. 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;
    sayName(){
        console.log(this.name);
    }
    sayAge(){
        console.log(this.age);
    }
}
var p:Persons = new Persons();
// console.log(p)
// console.log(p.name);
// console.log(p.age);
p.age = 30;
// console.log(p);
p.sayName();
p.sayAge();

class Students{
    protected name:string =  "lisi";
    sayName(){
        console.log(this.name);
    }
}
/* 
protected和private的区别：
    在子类中
        protected是可以访问的
        private是不可访问的
*/
class MidStudent extends Students{
    getName(){
        console.log(this.name);
    }
}var m:MidStudent = new MidStudent();
m.getName()