认识达内从这里开始

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function Person() {  //被继承的函数叫做超类型（父类，基类）

      this.name='mumu';

      this.age='18';

    }

    Person.prototype.name='susu';//当属性名相同时需就近原则，先在实例里面查找，没找到再到原型里找

    function Worker(){ //继承的函数叫做子类型（子类，派生类）

      this.job='student';

    }

    Worker.prototype=new Person();//通过原型链继承，超类型实例化后的对象实例，赋值给子类的原型属性

    var p2=new Worker();

    console.log(p2.name);

    console.log(p2 instanceof Object);//ture所有的构造函数都继承自Object

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function Person() { 

      this.bodys=['eye','foot'];

    }

    function Worker(){

    }

    Worker.prototype=new Person();

    var p1=new Worker();

    p1.bodys.push('hand');

    var p2=new Worker();

    console.log(p1.bodys);

    console.log(p2.bodys);

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function object(proto) {

    function F() {}

    F.prototype = proto;

    return new F();

  }

  var person = {

    name: 'mumu',

    friends: ['xiaxia', 'susu']

  };

  var anotherPerson = object(person);

  anotherPerson.friends.push('wen');

  var yetAnotherPerson = object(person);

  anotherPerson.friends.push('tian');

  console.log(person.friends);//["xiaxia", "susu", "wen", "tian"]

console.log(anotherPerson.__proto__)//Object {name: "mumu", friends: Array[4]}