怎样获取当前对象的原型对象prototype

1. 使用 Object.getPrototypeOf();

function Person(name){
    this.name = name;
}

var lilei = new Person("Lilei");
Object.getPrototypeOf(lilei); // {constructor: ƒ}

lilei.constructor.prototype; // {constructor: f}

2. 使用 obj.constructor.prototype;

function Person(name){
    this.name = name;
}

var lilei = new Person("Lilei");
lilei.constructor.prototype; // {constructor: ƒ}

3. 使用obj.__proto__;

function Person(name){
    this.name = name;
}

var lilei = new Person("Lilei");
lilei.__proto__; // {constructor: ƒ}

三种方法中, 第一种是最靠谱的, 后面两种都不太靠谱.