Reflect.ownKeys()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2016.

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。

尝试一下

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()

js
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
ECMAScript Language Specification
# sec-reflect.ownkeys

浏览器兼容性

BCD tables only load in the browser

参见