FED

Memory management in JavaScript is performed automatically and invisibly to us. We create primitives, objects, functions… All that takes memory.

像 C 语言这样的底层语言一般都有底层的内存管理接口，比如 malloc()和free()。相反，JavaScript 是在创建变量（对象，字符串等）时自动进行了分配内存，并且在不使用它们时“自动”释放。释放的过程称为垃圾回收。这个“自动”是混乱的根源，并让 JavaScript（和其他高级语言）开发者错误的感觉他们可以不关心内存管理。

Regardless of the language you use to write code, your program needs to allocate and access memory in order to store variables. In many…