如何从对象中过滤未定义的内容

function filterUndefined(obj) {
  for (let key in obj) {
    if (obj.hasOwnProperty(key) && typeof obj[key] === 'undefined') {
      delete obj[key];
    }
  }
  return obj;
}

// 示例用法
const obj = {
  name: 'John',
  age: undefined,
  gender: 'Male',
  address: undefined
};

const filteredObj = filterUndefined(obj);
console.log(filteredObj);

{
  name: 'John',
  gender: 'Male'
}