What are the ways to write JavaScript?

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Direct initialization method

Advantages:

1. UserData itself is an object instance. Instantiate a class when it comes up, and I'm not afraid that the browser can't stand it.

2. The code is compact.

3. High programming efficiency.

Disadvantages:

1. The reusability of the code is poor.

2. It does not accord with the idea of object-oriented programming. This kind of thing, design patterns, is often played around on classes. It's hard to use it directly on the object.

Summary: you should avoid using this method to create custom objects.

Use case: QQ mini pop-up window

Construction function method

How to use: you need to create an instance using "new and constructor".

Advantages:

Memory is allocated only when new is used. Without new, browsers will never give you memory resources. If you want it, ignore her if you don't want it!

Object expression

It is similar to the direct initialization method. It's actually a variety.

The red part above makes people dizzy. Anyone who reads this code will probably vomit blood wildly!

Anonymous function method

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