Singleton mode of JavaScript design pattern

Preface In the course of Javascript development, the pioneers have summed up many solutions to specific problems from practice. Simply put, a design pattern is a concise and elegant solution to a specific problem on a certain occasion In the future, I will record various common design patterns in Javascript. Maybe you are already familiar with it, maybe you are already using it, but you are not particularly familiar with its concept, or maybe you just have some vague concepts about it. Well, I believe this series will definitely bring you some gains Before understanding these common modes, by default you have at least mastered this closure higher order function Prototype and prototype chain Understanding them will give you a clearer understanding of a pattern. Of course, maybe the things I recorded about this aspect before can give you some help. Portal If there are any mistakes or mistakes in the article, please give advice to the friends who have seen it, thank you in advance Below, let’s start with it — the singleton pattern Concept As the name suggests, there is only one instance Definition: Ensure that a class has only one instance, and provide a global access point…