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This article mainly shows you "how to achieve singleton design pattern in web development", the content is easy to understand, clear, hope to help you solve your doubts, the following let Xiaobian lead you to study and learn "how to achieve singleton design pattern in web development" this article.

Singleton design pattern

I.

2. The end result is only one object.

1. Users cannot be allowed to new- > encapsulate the construction method

2. None of the objects can be obtained-> provide a method to get the object

3. Ordinary methods cannot be accessed externally-> static static methods are used to directly access the function of methods externally, modified with static

4. You can add judgment to the method-> add an attribute.

5. Ordinary properties can no longer be used statically-> this property is also modified with static.

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