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
const object1 = {
property1: 42,
property2: 13,
};
const array1 = [];
console.log(Reflect.ownKeys(object1));
// Expected output: Array ["property1", "property2"]
console.log(Reflect.ownKeys(array1));
// Expected output: Array ["length"]
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
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® 2026 Language Specification # sec-reflect.ownkeys |