Object.getPrototypeOf()

Object.getPrototypeOf() 方法返回指定对象的原型（内部[[Prototype]]属性的值）。

语法

Object.getPrototypeOf(object)

var my_obj = Object.create({}, {
  getFoo: {
    value: function() { return this.foo; },
    enumerable: false
  }
});
my_obj.foo = 1;
Object.defineProperty(my_obj, 'block' ,{
    value:520,
    writable:true,
    enumerable:true,
});

var my_obj = Object.create({}, {
  getFoo: {
    value: function() { return this.foo; },
    enumerable: true
  }
});
my_obj.foo = 1;
Object.defineProperty(my_obj, 'block' ,{
    value:520,
    writable:true,
    enumerable:true,
});
var pt =   Object.getPrototypeOf(my_obj)
console.log(Object.entries(my_obj))
console.log(my_obj.constructor)
console.log(my_obj.prototype.constructor) //TypeError: Cannot read property 'constructor' of undefined 
//我们是通过 Object.create() 创建的并不会给我们初始化Object.constructor这个东西