2020-05-05 继承的实现

不使用class：

      function Animal(name) {
        this.name = name;
      }
      function Cat(name) {
        Animal.call(this, name);
      }
      (function () {
        var Super = function () {};
        Super.prototype = Animal.prototype;
        Cat.prototype = new Super();
      })();
      Cat.prototype.constructor = Cat;
      var cat = new Cat();
      console.log(cat instanceof Animal);//true
      console.log(cat instanceof Cat);//true
      console.log(Cat.prototype.__proto__ == Animal.prototype);//true

使用class：

      class Animal {
        constructor(name) {
          this.name = name;
        }
        move() {}
      }
      class Dog extends Animal {
        constructor(name, color) {
          super(name);
          this.color = color;
        }
        bark() {}
      }
      var dog = new Dog("naruto");
      console.log(dog instanceof Animal);//true
      console.log(dog instanceof Dog);//true
      console.log(Dog.prototype.__proto__ === Animal.prototype);//true

参考： 幻天芒 JS实现继承的几种方式