Reflect.ownKeys() - JavaScript 编辑

静态方法 Reflect.ownKeys() 返回一个由目标对象自身的属性键组成的数组。

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语法

Reflect.ownKeys(target)

参数

target

获取自身属性键的目标对象。

返回值

由目标对象的自身属性键组成的 Array。 

异常

如果目标不是 Object，抛出一个 TypeError。

描述

Reflect.ownKeys 方法返回一个由目标对象自身的属性键组成的数组。它的返回值等同于Object.getOwnPropertyNames(target).concat(Object.getOwnPropertySymbols(target))。

示例

使用 Reflect.ownKeys()

Reflect.ownKeys({z: 3, y: 2, x: 1}); // [ "z", "y", "x" ]
Reflect.ownKeys([]); // ["length"]

var sym = Symbol.for("comet");
var sym2 = Symbol.for("meteor");
var obj = {[sym]: 0, "str": 0, "773": 0, "0": 0,
           [sym2]: 0, "-1": 0, "8": 0, "second str": 0};
Reflect.ownKeys(obj);
// [ "0", "8", "773", "str", "-1", "second str", Symbol(comet), Symbol(meteor) ]
// Indexes in numeric order,
// strings in insertion order,
// symbols in insertion order

规范

Specification	Status	Comment
ECMAScript 2015 (6th Edition, ECMA-262) Reflect.ownKeys	Standard	Initial definition.
ECMAScript (ECMA-262) Reflect.ownKeys	Living Standard

浏览器兼容

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相关链接

• Reflect
• Object.getOwnPropertyNames()