相同点

• 都不包括prototype上的属性

    function Person(name){
        this.name = name;
    }
    Person.prototype = {
        age:18,
        sayName: function () {
            console.log(this.name)
        }
    }

    let person1 = new Person('litao');

    console.log(Object.getOwnPropertyNames(person1)) //['name']
    console.log(Object.keys(person1)) //['name']

• 都不包括Symbol值作为名称的属性

const _item = Symbol('item')
const myobject = {
    name: 'Saku',
    age: '21',
    [_item]: 'mysymbol', 
    say() {
        console.log("Hello,world")
    }
}
console.log(Object.getOwnPropertyNames(myobject));// ["name", "age", "say"]
console.log(Object.keys(myobject)) //['name', 'age', 'say']

不同点

• 对于数组,Object.getOwnPropertyNames()包含一个名为 length 的属性，Object.keys()没有

const animals = ['dog', 'cat', 'tiger']

Object.keys(animals) // ['0', '1', '2']
Object.getOwnPropertyNames(animals) // ['0', '1', '2', 'length']

• Object.getOwnPropertyNames(obj) 返回对象 obj 的所有属性（包括可枚举和不可枚举)，而Object.keys(obj) 返回所有可枚举的属性。

const screen = {
    width: 1200,
    height: 800
}
Object.defineProperty(screen, 'resolution',{
    value: '2560 x 1440',
    enumerable: false //不可枚举
})

console.log(Object.getOwnPropertyNames(screen)) // ['width', 'height', 'resolution']
console.log(Object.keys(screen)) // ['width', 'height']