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 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 | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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 | 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