Observer mode for JavaScript design patterns (recommended) _javascript tips

Recommended reading: JavaScript Observer mode (Classic)

1. What is the Observer pattern

The observer pattern is sometimes referred to as the publish-subscribe model, in which an observer can manage all of the goals and give notice when the state changes. (In fact, the same is true for publish subscriptions in SQL Server)

2. Popular explanations

If the radio in the village was an observer, then every villager was the object of observation, and if there was a notice in the village and the policy changed, it would need to be released by radio instead of a direct home run to send a notice.

3. Code

<! DOCTYPE html>  

The

is written here, the Observer pattern is implemented, but there may be multiple villages that need this pattern, and that's how we can transform observer into constructors.

<! DOCTYPE html>  

About the JavaScript design mode of the Observer Mode Small series to introduce you here, I hope to help you!