深入JS继承

function my_new(func){
    var obj = {}
    obj._proto_ = func.prototype // 修改原型链指向，拼接至func原型链
    func.call(obj) // 实例属性赋值
    return obj
}

function createObj(o) {
  function F() { }
  F.prototype = o;
  return new F();
}
var parent = {
  name: 'trigkit4',
  arr: ['brother', 'sister', 'baba']
};
var child1 = createObj(parent);

function Parent() {
  this.name = 'mike';
}
function Child() {
  this.age = 12;
}
Child.prototype = new Parent();
child.prototype.contructor = child // 原型属性被覆盖，所以要修正回来。
var child1 = new Child();

function Parent(age) {
  this.name = ['mike', 'jack', 'smith'];
  this.age = age;
}
Parent.prototype.run = function () {
  return this.name + ' are both' + this.age;
};
function Child(age) {
  // 调用父类
  Parent.call(this, age);
}
var child1 = new Child(21);

child1.run //undefined

function Parent(age) {
  this.name = ['mike', 'jack', 'smith'];
  this.age = age;
}
Parent.prototype.run = function () {
  return this.name + ' are both' + this.age;
};
function Child(age) {
  // 调用父类构造函数
  Parent.call(this, age);
}
Child.prototype = new Parent();//原型属性继承
Child.prototype.contructor = Child
var child1 = new Child(21);

child1.run() // "mike,jack,smith are both21"

function Child(age) {
  // 调用父类构造函数，第二次
  Parent.call(this, age);
}
Child.prototype = new Parent();//修改原型链指向，第一次

function createObj(o) {
  function F() { }
  F.prototype = o;
  return new F();
}
//继承原型属性 即原型式继承
function create(parent, child) { 
  var f = createObj(parent.prototype);//获取原型对象
  child.prototype = f
  child.prototype.constructor = child;//增强对象原型，即保持原有constructor指向
}

function Parent(name) {
  this.name = name;
  this.arr = ['brother', 'sister', 'parents'];
}
Parent.prototype.run = function () {
  return this.name;
};
function Child(name, age) {
  // 示例属性
  Parent.call(this, name);
  this.age = age;
}
// 原型属性继承寄生于该方法中
create(Parent.prototype,Child);
var child1 = new Child('trigkit4', 21);