What is JavaScript: JavaScript is a client-side scripting language, i.e., it executes on user's machine rather than the server hosting the website. It creates interactive webpages and adds dynamic effects to them.
JavaScript is an object-oriented language like C++ and Java. However, it is not related to the Java language in any way.
The biggest feature of JavaScript is its ability to react on user's action, like button click, scrolling and typing. It enabled designers to convert their ideas into practicality, which was not possible before.
A good designer needs to know the basics first, only then they can fully explore the capabilities of JavaScript. It is considered that JS is the most powerful language at present. So, in this tutorial, we will cover all the basics and some advanced topics.
Netscape was competing with Microsoft. This 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 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 engine like Chrome has V8, Firefox has SpiderMonkey, and Safari has JavaScriptCore. All 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 are:
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, It does not have them even after being an OOP supporting language.
During development of JavaScript, Brendon Eich removed 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 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 its importance in today's world:
After all this theoretical knowledge, let start this JavaScript tutorial and see the first 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 the tutorial. Click on next to start learning the basic concepts.