Introduction to Constructor Pattern in JavaScript Design Patterns

This article mainly introduces the constructor pattern of JavaScript design patterns, and analyzes the concept, function, definition and usage of the constructor pattern in the form of examples. Friends in need can refer to the following

Examples of this article Introduced the constructor pattern of JavaScript design patterns. Share it with everyone for your reference, as follows:

1. Concept of constructor pattern

Constructor is used to create objects of a specific type - not only declares the used object, the constructor also Can accept parameters to set the object's member values ​​when the object is first created. You can customize your own constructor and declare properties or methods of custom type objects in it.

In JavaScript, constructors are usually used to implement instances. JavaScript does not have the concept of classes, but there are special constructors. The custom constructor is called through the new keyword. Inside the constructor, the this keyword refers to the newly created object.

2. The functions and precautions of the constructor pattern

Pattern functions:

1. Used to create objects of specific types

2.First Assign a value to the object when declaring it for the first time

3. Declare the constructor yourself, assign properties and methods

Notes:

1. Process business logic when declaring a function

2. Distinguish the difference between singleton and singleton, and implement initialization with singleton

3. Constructor function begins with a capital letter

3. Constructor pattern code and practical summary

The operation effect is as follows:

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