Object.getOwnPropertySymbols()

Object.getOwnPropertySymbols() 方法，返回一个数组，包含给定对象自身的所有 Symbol 属性。

// 语法:
Object.getOwnPropertySymbols(obj)

// 语法:

Object.getOwnPropertySymbols(obj)

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)

Object.getOwnPropertyNames(obj);    // []
// Object.getOwnPropertyNames()本身不包含对象的 Symbol 属性，只包含字符串属性。

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)

Object.getOwnPropertyNames(obj); // []

// Object.getOwnPropertyNames()本身不包含对象的 Symbol 属性，只包含字符串属性。

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Object.getOwnPropertySymbols()

Object.getOwnPropertySymbols()