获取对象属性名

1. 方法一

let aa = {
    name: 'xiaoming',
    age: 18,
    address: 'shanghai',
    phone: 1778282882828
};

for (let key in aa) {
    console.log(key);
}
output:
name
age
address
phone

2. 方法二

let aa = {
    name: 'xiaoming',
    age: 18
};

// Object.keys(aa) 返回对象属性名的数组

for (let key of Object.keys(aa)) {
    console.log(key);
}
output:
name
age

案例