如何获取一个对象的所有方法？[Javascript]

const obj = {
  method1() {},
  method2() {},
  property: 'value'
};

const methods = Object.getOwnPropertyNames(obj).filter((key) => typeof obj[key] === 'function');
console.log(methods); // ["method1", "method2"]

const obj = {
  method1() {},
  method2() {},
  property: 'value'
};

const methods = Object.keys(obj).filter((key) => typeof obj[key] === 'function');
console.log(methods); // ["method1", "method2"]

const obj = {
  method1() {},
  method2() {},
  property: 'value'
};

const methods = [];
for (let key in obj) {
  if (typeof obj[key] === 'function') {
    methods.push(key);
  }
}
console.log(methods); // ["method1", "method2"]