JS类的继承

class ProgrammingLanguage{
    constructor(usesCurlies){
        this.usesCurlies=usesCurlies;
    }
    compile(){
        console.log("Compiling, curlies: "+this.usesCurlies);
    }
}
class R extends ProgrammingLanguage {}
const lang1 = new R(true);
lang1.compile();

class Animal {
    pet(){
        console.log("wang wang wang");
    }
}
class Cat extends Animal {
    pet() {
        console.log("miao miao miao");
    }
}
const mindy = new Cat();
mindy.pet();