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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 .set() method works like setting a property on an 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.set(target, propertyKey, value[, receiver])
					

参数

target

The target object on which to set the property.

propertyKey

The name of the property to set.

value

The value to set.

receiver 可选

值 this provided for the call to target if a setter is encountered.

返回值

A 布尔 indicating whether or not setting the property was successful.

异常

A TypeError , if target is not an Object .

描述

Reflect.set method allows you to set a property on an object. It does property assignment and is like the property accessor syntax as a function.

范例

使用 Reflect.set()

// Object
let obj = {}
Reflect.set(obj, 'prop', 'value')  // true
obj.prop  // "value"
// Array
let arr = ['duck', 'duck', 'duck']
Reflect.set(arr, 2, 'goose')  // true
arr[2]  // "goose"
// It can truncate an array.
Reflect.set(arr, 'length', 1)  // true
arr  // ["duck"]
// With just one argument, propertyKey and value are "undefined".
let obj = {}
Reflect.set(obj)  // true
Reflect.getOwnPropertyDescriptor(obj, 'undefined')
// { value: undefined, writable: true, enumerable: true, configurable: true }
					

规范

规范
ECMAScript (ECMA-262) The definition of 'Reflect.set' 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
set	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
• 特性访问器

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()