如何在没有类声明的情况下将当前实例传递给另一个类的构造函数？

function MyClass() {
  // 构造函数逻辑
}

function AnotherClass(myInstance) {
  // 构造函数逻辑
  this.myInstance = myInstance;
}

function createInstance() {
  var instance = new MyClass();
  var anotherInstance = new AnotherClass(instance);
  return anotherInstance;
}

var myInstance = createInstance();

function MyClass() {
  // 构造函数逻辑
}

function AnotherClass() {
  // 构造函数逻辑
}

AnotherClass.prototype = new MyClass();
AnotherClass.prototype.constructor = AnotherClass;

var myInstance = new MyClass();
var anotherInstance = new AnotherClass();