如何判断 JavaScript 对象是在当前窗口还是另一个窗口中创建的

Short answer:

const OtherWindow = OtherObj.constructor.constructor('return window')();

Long answer:

Because most things are an object in JavaScript you can access their constructor with Object.getPrototypeOf(ObjectIn).constructor, from the objects prototype. But because of the prototype chain ObjectIn.constructor has the same effect.
And because that constructor is a function, its constructor is Function. And once we have Function we can access everything from that window with Function('return ...')().

因此，获得Function的实现可以如下所示:

const getFunction = (ObjectIn) => {
  // Get ObjectIn's constructor
  const ObjectInConstructor = ObjectIn.constructor;
  // Get Function
  return ObjectInConstructor.constructor;
};

const getObject = (ObjectIn) => {
  const Function = getFunction(ObjectIn);
  return Function('return Object')();
};

const OtherWindowObject = getObject(OtherObj);
const OtherWindow = getFunction(OtherObj)('return window')();

因为StackOverflow的HTTP标头不允许open()，所以我创建了一个fiddle来演示.