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This article mainly introduces "what is the role of JavaScript classes and modules". In daily operation, I believe that many people have doubts about the role of JavaScript classes and modules. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the doubts of "what is the role of JavaScript classes and modules?" Next, please follow the editor to study!

The implementation of classes in JavaScript is based on prototype inheritance mechanism. If two classes inherit from the same class, they are created and initialized by the same constructor.

Programming specification: define the constructor is to define the class, and the first letter of the class name should be capitalized.

Inheritance in JavaScript

Constructor object: defines a name for the class of JavaScript, and any properties added to this constructor object are class fields and class methods.

Prototype object: the properties of the prototype object are inherited by all instances of the class

Instance object: each instance of a class is the same independent object

The prototype-based inheritance mechanism in JavaScript is dynamic: objects inherit properties from the prototype. If the properties of the prototype change after the object is created, it will also affect all instance objects that inherit the prototype.

Instanceof operator

If o inherits from c.prototype, the value of the expression o instanceof c is true.

Duck type discrimination

Instead of focusing on what the object's class is, focus on what the object can do.

A bird that walks, swims and quacks like a duck is a duck.

At this point, the study on "what is the role of JavaScript classes and modules" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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