Javascript Tutorial: JavaScript(JS for short) is a widely used client-side scripting language
, i.e., it gets executed within the client's(user) browser. It creates interactive webpages and adds dynamic effects to them.
JavaScript is an object-oriented language
, i.e., it supports all object-oriented concepts like c++ or java. However, JavaScript is not related to the Java language in any way. So in this JS tutorial, we will cover all the basics and some advanced topics of JavaScript.
Netscape
competed with Microsoft. That is why they approached Sun Microsystems, which was about to launch a new programming language JAVA
. Java was a programming language that had all the features of Object-Oriented Programming.applet development
. However, there was still a need for a scripting language for websites to enhance the user’s interactivity
. Netscape, in collaboration with Sun Microsystems, developed LiveScript for its browser to compete with Internet Explorer of Microsoft..JavaScript Engine is a Software that is used to execute JavaScript. Earlier engines used to interpret the script but, the modern ones implement just-in-time compilation. Following steps are performed by a JavaScript Engine:
Every browser has its JavaScript engine like Chrome has V8, Firefox has SpiderMonkey, and Safari has JavaScriptCore
. All the engines do the same job.
Here is a small list of some applications of JavaScript, which we have covered in this tutorial-
Learning JavaScript is fun. It offers many features that a developer can use to make its website more appealing to the users. Some features of JavaScript are:
There are so many advantages of JavaScript, but we will discuss the most important ones in this JavaScript tutorial:
drag-and-drop
components and sliders
, which provide a rich interface to the users.dynamic pop-ups
.NodeJS
can develop server-side applications. It has been built on Chrome's JavaScript runtime for building fast and scalable network applications.AJAX (Asynchronous JavaScript)
Library of JavaScript is a handy tool to load the back-end data while doing some other work on the page. With this library's help, the web page can refresh some parts of it without reloading the whole page.We all know that JavaScript is an Object-Oriented
Language. In OOP, objects encapsulate data and methods together, defined by a hierarchy of abstract classes. Classes are necessary for the Object Orientation Language. However, JavaScript does not have them even after being an OOP supporting language.
During developing the JavaScript, Brendon Eich removed the classes. He developed a new style of OOPs in which, Objects could be created and linked to other objects without having any need to define a class. Now, JavaScript has the Capabilities of OOP, but it is free from the complexity of classes.
It is essential to learn JavaScript for aspiring designers and developers. It is the most powerful tool through which they can make very bold and attractive websites. We do not need to convince you to learn JavaScript as it is a necessity for Web Designers. We have listed some points to tell you the importance of JS in today's world:
After all this theoretical knowledge, let start this JavaScript tutorial and see the first JavaScript Example. Yes, our favorite, The “Hello World” program.
Look at the <script>
tag to define the type of scripting we are about to use within the document. We are using JavaScript, so the language type is also the same. The script contains only one line to print 'Hello World' on the screen.
<script>
tag indicates the implementation of JavaScript code within the Webpage.text/javascript
is the content type. It provides information to the browser that the script being used is 'JavaScript'.document.write()
function is used to display dynamic content through JavaScript. We will learn more about the document object model later.We hope that this introduction to JavaScript was good enough for you to continue this JavaScript tutorial. Click on next to start learning the basic concepts of JavaScript.
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