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JavaScript Classes are templates for JavaScript Objects. JavaScript Class Syntax. Use the keyword class to create a class. Always add a method named constructor (): Syntax. class ClassName { constructor () { ... } } Example. class Car { constructor (name, year) { this.name = name; this.year = year; } } The example above creates a class named "Car".
JavaScript Classes. A class is a type of function, but instead of using the keyword function to initiate it, we use the keyword class, and the properties are assigned inside a constructor () method: Example. Create a Car class, and then create an object called "mycar" based on the Car class:
Learn how to add a class name to an element with JavaScript. Add Class. Click the button to add a class to me! Add Class. Step 1) Add HTML: Add a class name to the div element with id="myDIV" (in this example we use a button to add the class). Example. <button onclick="myFunction ()">Try it</button> <div id="myDIV"> This is a DIV element. </div>
Inheritance is useful for code reusability: reuse properties and methods of an existing class when you create a new class.
W3Schools maintains a complete JavaScript reference, including all HTML and browser objects. The reference contains examples for all properties, methods and events, and is continuously updated according to the latest web standards.
25 lip 2024 · Classes are a template for creating objects. They encapsulate data with code to work on that data. Classes in JS are built on prototypes but also have some syntax and semantics that are unique to classes. For more examples and explanations, see the Using classes guide.
In JavaScript, classes are mainly an abstraction over the existing prototypical inheritance mechanism — all patterns are convertible to prototype-based inheritance. Classes themselves are normal JavaScript values as well, and have their own prototype chains.
