クラス継承に関するメモ

inherits.js

//inherits
function inherits(ctor, superCtor) {
  ctor.super_ = superCtor;
  ctor.prototype = Object.create(superCtor.prototype, {
    constructor: {
      value: ctor,
      enumerable: false,
      writable: true,
      configurable: true
    }
  });
}

//A
function A(n){
  this.n = n;
  this.n10 = n*10;
}

A.prototype.a_method = function(){
  return this.n + this.n10;
}

//B
function B(n){
  A.call(this,n);
}

inherits(B,A);

//init
var b = new B(1);
b.a_method(); //11