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• 句法
• 描述
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

静态 Reflect .getPrototypeOf() method is almost the same method as Object.getPrototypeOf() . It returns the prototype (i.e. the value of the internal [[Prototype]] property) of the specified object.

The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

句法

Reflect.getPrototypeOf(target)
					

参数

target

The target object of which to get the prototype.

返回值

The prototype of the given object. If there are no inherited properties, null 被返回。

异常

A TypeError , if target is not an Object .

描述

Reflect.getPrototypeOf method returns the prototype (i.e. the value of the internal [[Prototype]] property) of the specified object.

范例

使用 Reflect.getPrototypeOf()

Reflect.getPrototypeOf({})                  // Object.prototype
Reflect.getPrototypeOf(Object.prototype)    // null
Reflect.getPrototypeOf(Object.create(null)) // null
					

Compared to Object.getPrototypeOf()

// Same result for Objects
Object.getPrototypeOf({})   // Object.prototype
Reflect.getPrototypeOf({})  // Object.prototype
// Both throw in ES5 for non-Objects
Object.getPrototypeOf('foo')   // Throws TypeError
Reflect.getPrototypeOf('foo')  // Throws TypeError
// In ES2015 only Reflect throws, Object coerces non-Objects
Object.getPrototypeOf('foo')   // String.prototype
Reflect.getPrototypeOf('foo')  // Throws TypeError
// To mimic the Object ES2015 behavior you need to coerce
Reflect.getPrototypeOf(Object('foo'))  // String.prototype
					

规范

规范
ECMAScript (ECMA-262) The definition of 'Reflect.getPrototypeOf' in that specification.

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
getPrototypeOf	Chrome 49	Edge 12	Firefox 42	IE No	Opera 36	Safari 10	WebView Android 49	Chrome Android 49	Firefox Android 42	Opera Android 36	Safari iOS 10	Samsung Internet Android 5.0	nodejs 6.0.0

图例

完整支持

完整支持

不支持

不支持

另请参阅

• Reflect
• Object.getPrototypeOf()

元数据

• 最后修改： Jan 15, 2020

相关话题

1. 标准内置对象
2. Reflect
3. 方法
   1. Reflect.apply()
   2. Reflect.construct()
   3. Reflect.defineProperty()
   4. Reflect.deleteProperty()
   5. Reflect.get()
   6. Reflect.getOwnPropertyDescriptor()
   7. Reflect.getPrototypeOf()
   8. Reflect.has()
   9. Reflect.isExtensible()
   10. Reflect.ownKeys()
   11. Reflect.preventExtensions()
   12. Reflect.set()
   13. Reflect.setPrototypeOf()
4. 继承：
5. Object
6. 特性
   1. Object.prototype.__proto__
   2. Object.prototype.constructor
7. 方法
   1. Object.prototype.__defineGetter__()
   2. Object.prototype.__defineSetter__()
   3. Object.prototype.__lookupGetter__()
   4. Object.prototype.__lookupSetter__()
   5. Object.prototype.hasOwnProperty()
   6. Object.prototype.isPrototypeOf()
   7. Object.prototype.propertyIsEnumerable()
   8. Object.prototype.toLocaleString()
   9. Object.prototype.toSource()
   10. Object.prototype.toString()
   11. Object.prototype.valueOf()
   12. Object.setPrototypeOf()