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Above picture: obj stores the address, pointing to the object in the heap
So how is obj.a represented by a stack? It would be better to have a picture, thank you!
In v8, using {a: 1}的时候, 会创建一个隐藏类, 有一个属性a, 类型为number, 偏移为0. 当通过obj.a获取这个类的实例的a属性时, 会通过obj查到堆中的起始地址, 加上偏移就可以获取到obj.a的地址了. 在古老的浏览器中, 一个object就是一个单纯的hash table, 和PHP is very similar.
{a: 1}
a
number
0
obj.a
obj
object
hash table
PHP
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
In v8, using
{a: 1}的时候, 会创建一个隐藏类, 有一个属性a, 类型为number, 偏移为0. 当通过obj.a获取这个类的实例的a属性时, 会通过obj查到堆中的起始地址, 加上偏移就可以获取到obj.a的地址了. 在古老的浏览器中, 一个object就是一个单纯的hash table, 和PHPis very similar.