如何从javascript类方法返回值？

class MyClass {
  myMethod() {
    return 'Hello, World!';
  }
}

const myObject = new MyClass();
const result = myObject.myMethod();
console.log(result); // 输出：Hello, World!

class MyClass {
  myMethod() {
    this.result = 'Hello, World!';
  }
}

const myObject = new MyClass();
myObject.myMethod();
console.log(myObject.result); // 输出：Hello, World!

class MyClass {
  myMethod(callback) {
    setTimeout(() => {
      const result = 'Hello, World!';
      callback(result);
    }, 1000);
  }
}

const myObject = new MyClass();
myObject.myMethod((result) => {
  console.log(result); // 输出：Hello, World!
});

class MyClass {
  myMethod() {
    return new Promise((resolve, reject) => {
      setTimeout(() => {
        const result = 'Hello, World!';
        resolve(result);
      }, 1000);
    });
  }
}

const myObject = new MyClass();
myObject.myMethod()
  .then((result) => {
    console.log(result); // 输出：Hello, World!
  })
  .catch((error) => {
    console.error(error);
  });