如何枚举JavaScript对象的属性？

for (variable in object) {
  // 执行的代码块
}

const obj = {
  name: 'Tom',
  age: 18,
  gender: 'male'
};

for (let key in obj) {
  console.log(`${key}: ${obj[key]}`);
}

name: Tom
age: 18
gender: male

Object.keys(object);

const obj = {
  name: 'Tom',
  age: 18,
  gender: 'male'
};

const keys = Object.keys(obj);
console.log(keys); // ['name', 'age', 'gender']

Object.values(object);

const obj = {
  name: 'Tom',
  age: 18,
  gender: 'male'
};

const values = Object.values(obj);
console.log(values); // ['Tom', 18, 'male']

Object.entries(object);

const obj = {
  name: 'Tom',
  age: 18,
  gender: 'male'
};

const entries = Object.entries(obj);
console.log(entries); // [['name', 'Tom'], ['age', 18], ['gender', 'male']]