如何获取特定Javascript属性的名称？

const obj = { name: 'John', age: 25, city: 'New York' };
const propertyNames = Object.keys(obj);
console.log(propertyNames); // ['name', 'age', 'city']

const obj = { name: 'John', age: 25, city: 'New York' };
for (let propertyName in obj) {
  console.log(propertyName); // 'name', 'age', 'city'
}

const obj = { name: 'John', age: 25, city: 'New York' };
const propertyNames = Reflect.ownKeys(obj);
console.log(propertyNames); // ['name', 'age', 'city']