Object.getOwnPropertySymbols()

¥Syntax

Object.getOwnPropertySymbols(obj)

¥Parameters

obj

要返回其符号属性的对象。

¥Return value

直接在给定对象上找到的所有符号属性的数组。

¥An array of all symbol properties found directly upon the given object.

¥Description

与 Object.getOwnPropertyNames() 类似，你可以获取给定对象的所有符号属性作为符号数组。请注意，Object.getOwnPropertyNames() 本身不包含对象的符号属性，仅包含字符串属性。

¥Similar to Object.getOwnPropertyNames(), you can get all symbol properties of a given object as an array of symbols. Note that Object.getOwnPropertyNames() itself does not contain the symbol properties of an object and only the string properties.

由于所有对象最初都没有自己的符号属性，因此 Object.getOwnPropertySymbols() 返回一个空数组，除非你在对象上设置了符号属性。

¥As all objects have no own symbol properties initially, Object.getOwnPropertySymbols() returns an empty array unless you have set symbol properties on your object.

¥Examples

¥Using Object.getOwnPropertySymbols()

const obj = {};
const a = Symbol("a");
const b = Symbol.for("b");

obj[a] = "localSymbol";
obj[b] = "globalSymbol";

const objectSymbols = Object.getOwnPropertySymbols(obj);

console.log(objectSymbols.length); // 2
console.log(objectSymbols); // [Symbol(a), Symbol(b)]
console.log(objectSymbols[0]); // Symbol(a)

¥See also

• core-js 中 Object.getOwnPropertySymbols 的 Polyfill
• Object.getOwnPropertyNames()
• Symbol