Object.defineProperty()
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperties
getOwnPropertyDescriptor
返回指定对象上一个自有属性对应的属性描述符
Object.defineProperty()
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperties
getOwnPropertyDescriptor
返回指定对象上一个自有属性对应的属性描述符