Object.getOwnPropertySymbols()
方法返回一个给定对象自身的所有 Symbol 属性的数组。
语法
Object.getOwnPropertySymbols(obj)
参数
-
obj
- 要返回 Symbol 属性的对象。
-
返回值
- 在给定对象自身上找到的所有 Symbol 属性的数组。
描述
与Object.getOwnPropertyNames()
本身不包含对象的 Symbol 属性,只包含字符串属性。
因为所有的对象在初始化的时候不会包含任何的 Symbol,除非你在对象上赋值了 Symbol 否则Object.getOwnPropertySymbols()
只会返回一个空的数组。
示例
var obj = {}; var a = Symbol("a"); var b = Symbol.for("b"); obj[a] = "localSymbol"; obj[b] = "globalSymbol"; var objectSymbols = Object.getOwnPropertySymbols(obj); console.log(objectSymbols.length); // 2 console.log(objectSymbols) // [Symbol(a), Symbol(b)] console.log(objectSymbols[0]) // Symbol(a)
规范
Specification | Status | Comment |
---|---|---|
ECMAScript 2015 (6th Edition, ECMA-262) Object.getOwnPropertySymbols |
Standard | Initial definition. |
ECMAScript Latest Draft (ECMA-262) Object.getOwnPropertySymbols |
Draft |
浏览器兼容
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 | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
getOwnPropertySymbols |
Chrome Full support 38 | Edge Full support 12 | Firefox Full support 36 | IE No support No | Opera Full support 25 | Safari Full support 9 | WebView Android Full support 38 | Chrome Android Full support 38 | Firefox Android Full support 36 | Opera Android Full support 25 | Safari iOS Full support 9 | Samsung Internet Android Full support 3.0 | nodejs Full support 0.12 |
Legend
- Full support
- Full support
- No support
- No support