bind与继承 待研究

class a {
  f() {
    console.log('a')
  }
  get f2() {
    console.log('f2')
    return (this['f'] = this.f.bind(this));
  }
}

class b extends a {
  constructor() {
    super()
    this.f = this.f.bind(this)
  }
  f() {
    console.log('b')
    super.f2();
  }
  get f2() {
    return (this['f'] = this.f.bind(this));
  }
}

let instance = new b();
instance.f2();

// for (var i = 0; i < 5; ++i) {
//   console.log('invoking');
//   instance.f2();
//   console.log('---');
// }

class a {
  // constructor() {
  //   this.f2 = this.f.bind(this);
  // }
  f() {
    console.log('a')
  }
  f2() {
    // console.log(this)
    console.log('f2')
    if (!this.f3) {
      this.f3 = this.f.bind(this);
    }
    return this.f3
  }
}

class b extends a {
  // constructor() {
  //   super()
  //   this.f = this.f.bind(this)
  // }
  constructor() {
    super();
    this.f2 = this.f.bind(this);
  }
  f() {
    console.log('b')
    super.f2();
    this.f2 = this.f.bind(this);
  }
  // get f2() {
  //   console.log(this)
  //   return (this['f'] = this.f.bind(this));
  // }
}

let instance = new b();
instance.f2();

for (var i = 0; i < 5; ++i) {
  console.log('invoking');
  instance.f2();
  console.log('---');
}

https://github.com/jayphelps/core-decorators/pull/21

https://github.com/jayphelps/core-decorators/blob/master/src/autobind.js

https://github.com/jayphelps/core-decorators/issues/20  autobind用weakmap的原因