实现instanceof

function MyInstanceof(l,r){
    let Lproto = l.__proto__;
    const Rproto = r.prototype;
    while(Lproto){
        if(Lproto === Rproto){
            return true
        }else{
            Lproto=Lproto.__proto__;
        }
    }
    return false;
}
class a {
    constructor() {
        this.a = 1;
    }
}
let b= new a;
console.log(MyInstanceof(b,Object))
console.log(MyInstanceof(b,a))
console.log(MyInstanceof(b,Function))