在此页

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

Object.getOwnPropertyDescriptors() method returns all own property descriptors of a given object.

句法

Object.getOwnPropertyDescriptors(obj)
					

参数

obj

The object for which to get all own property descriptors.

返回值

An object containing all own property descriptors of an object. Might be an empty object, if there are no properties.

描述

This method permits examination of the precise description of all own properties of an object. A property in JavaScript consists of either a string-valued name or a Symbol and a property descriptor. Further information about property descriptor types and their attributes can be found in Object.defineProperty() .

A property descriptor is a record with some of the following attributes:

value

The value associated with the property (data descriptors only).

writable

true if and only if the value associated with the property may be changed (data descriptors only).

get

A function which serves as a getter for the property, or undefined if there is no getter (accessor descriptors only).

set

A function which serves as a setter for the property, or undefined if there is no setter (accessor descriptors only).

configurable

true if and only if the type of this property descriptor may be changed and if the property may be deleted from the corresponding object.

enumerable

true if and only if this property shows up during enumeration of the properties on the corresponding object.

范例

Creating a shallow clone

Whereas the Object.assign() method will only copy enumerable and own properties from a source object to a target object, you are able to use this method and Object.create() for a shallow copy between two unknown objects:

Object.create(
  Object.getPrototypeOf(obj),
  Object.getOwnPropertyDescriptors(obj)
);
					

Creating a subclass

A typical way of creating a subclass is to define the subclass, set its prototype to an instance of the superclass, and then define properties on that instance. This can get awkward especially for getters and setters. Instead, you can use this code to set the prototype:

function superclass() {}
superclass.prototype = {
  // Define your methods and properties here
};
function subclass() {}
subclass.prototype = Object.create(
  superclass.prototype,
  {
    // Define your methods and properties here
  }
);
					

规范

规范
ECMAScript (ECMA-262) The definition of 'Object.getOwnPropertyDescriptors' 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
getOwnPropertyDescriptors	Chrome 54	Edge 15	Firefox 50	IE No	Opera 41	Safari 10	WebView Android 54	Chrome Android 54	Firefox Android 50	Opera Android 41	Safari iOS 10	Samsung Internet Android 6.0	nodejs 7.0.0 7.0.0 6.5.0 Disabled Disabled From version 6.5.0: this feature is behind the --harmony runtime flag.

图例

完整支持

完整支持

不支持

不支持

用户必须明确启用此特征。

用户必须明确启用此特征。

另请参阅

• Object.getOwnPropertyDescriptor()
• Object.defineProperty()
• Polyfill

元数据

• 最后修改： 2020 年 1 月 22 日

相关话题

1. 标准内置对象
2. Object
3. 特性
   1. Object.prototype.__proto__
   2. Object.prototype.constructor
4. 方法
   1. Object.assign()
   2. Object.create()
   3. Object.defineProperties()
   4. Object.defineProperty()
   5. Object.entries()
   6. Object.freeze()
   7. Object.fromEntries()
   8. Object.getOwnPropertyDescriptor()
   9. Object.getOwnPropertyDescriptors()
   10. Object.getOwnPropertyNames()
   11. Object.getOwnPropertySymbols()
   12. Object.getPrototypeOf()
   13. Object.is()
   14. Object.isExtensible()
   15. Object.isFrozen()
   16. Object.isSealed()
   17. Object.keys()
   18. Object.preventExtensions()
   19. Object.prototype.__defineGetter__()
   20. Object.prototype.__defineSetter__()
   21. Object.prototype.__lookupGetter__()
   22. Object.prototype.__lookupSetter__()
   23. Object.prototype.hasOwnProperty()
   24. Object.prototype.isPrototypeOf()
   25. Object.prototype.propertyIsEnumerable()
   26. Object.prototype.toLocaleString()
   27. Object.prototype.toSource()
   28. Object.prototype.toString()
   29. Object.prototype.valueOf()
   30. Object.seal()
   31. Object.setPrototypeOf()
   32. Object.values()
5. 继承：
6. Function
7. 特性
   1. Function.arguments
   2. Function.caller
   3. Function.displayName
   4. Function.length
   5. Function.name
8. 方法
   1. Function.prototype.apply()
   2. Function.prototype.bind()
   3. Function.prototype.call()
   4. Function.prototype.toSource()
   5. Function.prototype.toString()