By Vishal Basumatary in javascript — Mar 25, 2023

if javascript

If Javascript

If you are a web developer, then you must have heard about the term "JavaScript". It is one of the most popular programming languages used in front-end web development.

What is JavaScript?

JavaScript is a high-level programming language that is used to create interactive and dynamic websites. It is an object-oriented scripting language that runs on the client-side of the web browser. JavaScript can be used for various purposes such as form validation, creating interactive menus, creating animations, and much more.

How to use JavaScript?

To use JavaScript in your website, you need to embed it in the HTML code of your website. You can do this by adding the <script> tag in the HTML code of your page.

<script>
   // Your JavaScript code here
</script>

You can also link an external JavaScript file to your HTML code using the <script> tag.

<script src="path/to/your/javascript/file.js"></script>

Multiple ways to use JavaScript

There are various ways to use JavaScript in your website, some of them are:

Inline JavaScript
Internal JavaScript
External JavaScript

Inline JavaScript

Inline JavaScript is the code that is written directly on the HTML element using the onEvent attribute. For example:

<button onclick="alert('Hello World!')">Click Me</button>

Internal JavaScript

Internal JavaScript is the code that is written inside the <script> tag in the HTML file. For example:

<script>
   function sayHello(){
      alert('Hello World!');
   }
</script>

<button onclick="sayHello()">Click Me</button>

External JavaScript

External JavaScript is the code that is written in a separate .js file and then linked to the HTML file using the <script> tag. For example:

In your HTML file:

<script src="path/to/your/javascript/file.js"></script>

In your .js file:

function sayHello(){
   alert('Hello World!');
}

Conclusion

JavaScript is a powerful tool for front-end web development. It allows you to create dynamic and interactive websites. By using the various techniques mentioned above, you can easily integrate JavaScript into your website.