我們知道JS是面對(duì)對(duì)象的編程語(yǔ)言螃征，但其實(shí)很多人對(duì)JS中的對(duì)象沒(méi)有足夠的理解闲昭。這次我們從ES規(guī)范入手更耻，深入的理解object脱羡。
我們來(lái)看看ES規(guī)范是如何定義object的：
- An Object is logically a collection of properties.
- Each property is either a data property, or an accessor property
- A data property associates a key value with an ECMAScript language value and a set of Boolean attributes.
- An accessor property associates a key value with one or two accessor functions, and a set of Boolean attributes. The accessor functions are used to store or retrieve an ECMAScript language value that is associated with the property.
可以看到找都，一個(gè)object就是由一個(gè)個(gè)屬性（property）以及屬性描述符(attributes)組成的唇辨。而屬性又分為兩種，數(shù)據(jù)屬性（data property）和訪問(wèn)屬性（ accessor property）能耻。
比如說(shuō)上述的obj1,它就有兩個(gè)數(shù)據(jù)屬性a b,他們的值分別為1 2赏枚。那它的屬性描述符是什么呢？
截圖自ECMAScript
我們可以再JS代碼中這樣查看：
var obj1 = {
a: 1,
b: 2
}
console.log(Object.getOwnPropertyDescriptor(obj1, 'a'))
{ value: 1, writable: true, enumerable: true, configurable: true }
這就是對(duì)象的全部面貌嗎晓猛？好有很多
