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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.get() method works like getting a property from an object ( target[propertyKey] ) as a function.

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.get(target, propertyKey[, receiver])
					

参数

target

The target object on which to get the property.

propertyKey

The name of the property to get.

receiver 可选

值 this provided for the call to target if a getter is encountered. When used with Proxy , it can be an object that inherits from target .

返回值

The value of the property.

异常

A TypeError , if target is not an Object .

描述

Reflect.get method allows you to get a property on an object. It is like the property accessor syntax as a function.

范例

使用 Reflect.get()

// Object
let obj = { x: 1, y: 2 }
Reflect.get(obj, 'x')  // 1
// Array
Reflect.get(['zero', 'one'], 1)  // "one"
// Proxy with a get handler
let x = {p: 1};
let obj = new Proxy(x, {
  get(t, k, r) {
    return k + 'bar'
  }
})
Reflect.get(obj, 'foo')  // "foobar"
//Proxy with get handler and receiver
let x = {p: 1, foo: 2};
let y = {foo: 3};
let obj = new Proxy(x, {
  get(t, prop, receiver) {
    return receiver[prop] + 'bar'
  }
})
Reflect.get(obj, 'foo', y) // "3bar"
					

规范

规范
ECMAScript (ECMA-262) The definition of 'Reflect.get' 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
get	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： Apr 11, 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()