A compact Class solution

(function(){
    function Extend(func,proto){
        func.prototype.__proto__=proto.prototype;
        Object.defineProperty(func.prototype,"proto",{
            value: proto.prototype
        });
    }
    function Super(func,method){
        if(!method) method='constructor';
        return func.prototype.__proto__[method];
    }
    window.Extend=Extend;
    window.Super=Super;
})();

Encountered an infinite loop when processing super's super:

this.super-->this.proto.constructor(){this.super}-->this.proto.constructor. . .

Later, I directly used the method in the above code. I didn’t want to make it too complicated (I just didn’t know...)

(function(){
    function AAA(name){
        this.name=name;
    }
    function BBB(name){
        Super(BBB).call(this,name);
    }
    Extend(BBB,AAA);
    function CCC(name,age){
        Super(CCC).call(this,name);
        this.age=age;
    }
    Extend(CCC,BBB);
    var c=new CCC('ccc',18);
    console.log(c);
})();

Then I didn’t want to pollute the Function, so I could only pollute the window. . .

Would it be easier to put it inside a Function?

(function(){
    Function.prototype.Extend=function(proto){
        this.prototype.__proto__=proto.prototype;
    }
    Function.prototype.Super=function(method){
        if(!method) method='constructor';
        return this.prototype.__proto__[method];
    }
})();
(function(){
    function AAA(name){
        this.name=name;
    }
    function BBB(name){
        BBB.Super().call(this,name);
    }
    BBB.Extend(AAA);
    function CCC(name,age){
        CCC.Super().call(this,name);
        this.age=age;
    }
    CCC.Extend(BBB);
    var c=new CCC('ccc',18);
    console.log(c);
})();