类

class demo{ 
    
    constructor(public name) {
        // console.log(name)
     }
    demo1() {
        // this.name = 111;
        console.log(this.name)
     }
}
class demo3 extends demo {
    code;
    constructor(age,sex) {
        super(name);
        this.code=age
     }
    demo4() { 
        //console.log(this.code)
        super.demo1();
        this.demo6();
    }
    private demo6() { 
        console.log(11111)
    }
 }

// let demo2 = new demo("3333");
// demo2.demo1();
let demo5 = new demo3("1111","2222");
demo5.demo4();