class Parent {
            constructor(name) {
                this.name = name;
                console.log(this);
            }
            speak() {
                console.log('speak');
                console.log(this);
            }
            static speak() {
                console.log('Person static speak');
                console.log(this);
            }
        }
        class Son extends Parent {
            run() {
                console.log('Son run...');
            }
        }
        const me=new Son('jack');
        console.log(me);
        me.run();
        me.speak();
        Son.speak();
        console.log(me.name);

老师这里子类没写super，但是一样继承了父类constructor里面的name属性呢