静态方法 `Reflect``.set()` 工作方式就像在一个对象上设置一个属性。

## 语法

    Reflect.set(target, propertyKey, value[, receiver])

### 参数

`target`
  设置属性的目标对象。
`propertyKey`
  设置的属性的名称。
value
  设置的值。
receiver
  如果遇到 setter，this 将提供给目标调用。

### 返回值

返回一个 `Boolean` 值表明是否成功设置属性。

### 异常

抛出一个 `TypeError`，如果目标不是 `Object`。

## 描述

`Reflect.set` 方法允许你在对象上设置属性。它的作用是给属性赋值并且就像 property accessor 语法一样，但是它是以函数的方式。

## 示例

### 使用 `Reflect.set()`

    // Object
    var obj = {};
    Reflect.set(obj, "prop", "value"); // true
    obj.prop; // "value"

    // Array
    var 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".
    var obj = {};
    Reflect.set(obj); // true
    Reflect.getOwnPropertyDescriptor(obj, "undefined");
    // { value: undefined, writable: true, enumerable: true, configurable: true }

## 规范

Specification | Status | Comment
--- | --- | ---
ECMAScript 2015 (6th Edition, ECMA-262) Reflect.set | Standard | Initial definition.
ECMAScript Latest Draft (ECMA-262) Reflect.set | Draft |

## 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.

Update compatibility data on GitHub

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

### Legend

Full support
  Full support
No support
  No support

## 相关链接

- `Reflect`
- Property accessors