nodejs中当前类的实例

class Foo {}
class Bar {}
class Fizz {
  // Member function that checks if other 
  // is an instance of the Fizz class without 
  // referring to the actual classname "Fizz"
  some(other) {
    return other instanceof this.constructor;
  }
}

const a = new Foo();
const b = new Foo();
const c = new Bar();
const d = new Fizz();
const e = new Fizz();

console.log(a instanceof b.constructor); // true
console.log(a instanceof c.constructor); // false
console.log(d.some(a)); // false
console.log(d.some(e)); // true