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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 2016年9月.
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 |