How to understand JavaScript garbage collection mechanism

This article introduces the relevant knowledge of "how to understand the JavaScript garbage collection mechanism". Many people will encounter such a dilemma in the operation of actual cases, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Mechanism description

1. Find out the variables that are no longer in use, and then release the memory it occupies.

2, this process is not always, because its cost is relatively high, so the garbage collector will be carried out at fixed intervals.

classification

(1) reference count

The reference counting algorithm defines the standard of "memory is no longer used", which is simply to see if an object has a reference to it.

(2) Mark removal

The tag cleanup algorithm defines "objects that are no longer in use" as "unreachable objects".

Example

Var a = "sailing in the waves"; var b = "front-end craftsman"; var a = b; / / rewrite a "how to understand the JavaScript garbage collection mechanism". Thank you for reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!