symbol

JavaScript 中有一个原语用于通过函数 Symbol() 创建全局唯一引用：

There is a primitive in JavaScript used to create a globally unique reference via the function Symbol():

const firstName = Symbol("name");
const secondName = Symbol("name");

if (firstName === secondName) {
  // Can't ever happen
}

您可以在 符号参考页 中了解有关它们的更多信息。

You can learn more about them in Symbols reference page.