关于es6类里的super方法和get set方法

class Esc {
  constructor(id, region, name) {
    this.id = id;
    this.region = region;
    this.name = name;
  }
  buy() {
    return `https://xxxx.com?id=${this.id}&region=${this.region}&name=${this.name}`;
  }
}

class SubEsc extends Esc {
  constructor(id, region, name) {
    // Uncaught ReferenceError:Must call super constructor in derived class before accessing 'this' or returning from derived constructor
    //this.instance = name;  

    super(id, region, name);

    this.instance = name;  
  }

  get config() {
    return this
  }

  set props(value) {
    console.log(value, 333)
  }
}

let subesc = new SubEsc(1, 'xm', 'wml')