js 获取对象的属性名(key)列表

keys() 方法获取

values()可以获取键值列表

const person = {name: "Bill",age: 19,eyeColor: "blue"
};
const keys = Object.keys(person);
console.log(keys)// ['name', 'age', 'eyeColor']

for in 语句获取

const person = {name: "Bill",age: 19,eyeColor: "blue"
};
const keys = []
for(var k in person){keys.push(k)
}
console.log(keys)// ['name', 'age', 'eyeColor']

getOwnPropertyNames() 方法获取

const person = {name: "Bill",age: 19,eyeColor: "blue"
};
const keys = Object.getOwnPropertyNames(person)
console.log(keys)// ['name', 'age', 'eyeColor']