4-6 寄生组合式继承

<script>
    // 1. 创建一个组合式继承
    function Father(name, age) {
        this.name = name;
        this.age = age;
        this.list = [1, 2, 3];
    }
    Father.prototype.say = function() {
        console.log(this.name);
    }
    function Child(name, age) {
        // 借用构造函数
        Father.call(this, name, age);
    }
    // 2. 添加寄生式继承Object.create
    Child.prototype = Object.create(Father.prototype);
    // Child.prototype.__proto__ === Father.prototype;  产生原型的继承关系
    console.log(Child.prototype.constructor === Child); // false, 因为寄生式继承破坏了原来的原型关系
    // 3. 重新制定子类原型对象的构造函数
    Child.prototype.constructor = Child;
    var child = new Child('张三', 18);
    console.log('child', child);
</script>