📜  Javascript Object getPrototypeOf()方法

📅  最后修改于: 2020-10-25 11:44:27             🧑  作者: Mango

JavaScript Object.getPrototypeOf()方法

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

句法:

Object.getPrototypeOf(obj)

参数

obj:这是一个将返回其原型的对象。

返回值:

此方法返回给定对象的原型。如果没有继承的属性,则此方法将返回null。

浏览器支持:

Chrome 5
Edge Yes
Firefox 3.5
Opera 12.1

例子1

let animal = {
  eats: true
};
   // create a new object with animal as a prototype
let rabbit = Object.create(animal);
alert(Object.getPrototypeOf(rabbit) === animal); // get the prototype of rabbit

Object.setPrototypeOf(rabbit, {}); // change the prototype of rabbit to {}

输出:

true

例子2

const prototype1 = {};
const object1 = Object.create(prototype1);
const prototype2 = {};
const object2 = Object.create(prototype2);
console.log(Object.getPrototypeOf(object1) === prototype1);
console.log(Object.getPrototypeOf(object1) === prototype2); 

输出:

true
false

例子3

const prototype1 = {};
const object1 = Object.create(prototype1);
const prototype2 = {};
const object2 = Object.create(prototype2);
console.log(Object.getPrototypeOf(object1) === prototype1);
console.log(Object.getPrototypeOf(object2) === prototype2); 

输出:

true
true