Nodejs繼承簡單實現

代碼如下：

function Animal() {
  this.name = 'animal';
}
 
function Cat(name) {
  Animal.call(this);
  this.name = name || 'Tom';
}
 
(function (d, b) {
  function __() { this.constructor = d; }
  __.prototype = b.prototype;
  d.prototype = new __();
})(Cat, Animal);

 或

function Animal() {
  this.name = 'animal';
}

function Cat(name) {
  Animal.call(this);
  this.name = name || 'Tom';
}

require('util').inherits(Cat, Animal);
// <=> Cat.super_ = Animal; Object.setPrototypeOf(Cat.prototype, Animal.prototype);