---
title: "How Do I: Create and Use Classes in JavaScript? | Microsoft Docs"
author: rick-anderson
description: "In this video Chris Pels shows how to create classes in JavaScript with functionality similar to other programming languages with object oriented capabilitie..."
ms.author: aspnetcontent
manager: wpickett
ms.date: 01/08/2010
ms.topic: article
ms.assetid: 348d1bda-69e0-4cb5-a59f-a104133c2f93
ms.technology: dotnet-webforms
ms.prod: .net-framework
msc.legacyurl: /web-forms/videos/how-do-i/how-do-i-create-and-use-classes-in-javascript
msc.type: video
---
How Do I: Create and Use Classes in JavaScript?
====================
by [Chris Pels](https://twitter.com/chrispels)

In this video Chris Pels shows how to create classes in JavaScript with functionality similar to other programming languages with object oriented capabilities. First a sample web site project is created with an external JavaScript file. A function() is created and the difference between using the function as a "function" and as a class constructor with the "new" keyword is discussed. Then public properties are added to the class constructor as well as private variables. Next a separate function is created and assigned as a method to the class. Alternatively, the same method is shown as a function defined in the class constructor. Finally, a private class method is created and used within the class constructor.

[▶ Watch video (18 minutes)](https://channel9.msdn.com/Blogs/ASP-NET-Site-Videos/how-do-i-create-and-use-classes-in-javascript)