How to use javascript variable in html?

Introduction

JavaScript is a versatile programming language that allows developers to create dynamic and interactive elements on webpages. One of the key features of JavaScript is its ability to work with variables, which are containers for storing data. In this article, we will explore how to use JavaScript variables in HTML to enhance the functionality and interactivity of your webpages.

Using JavaScript Variables in HTML

To use JavaScript variables in HTML, you need to understand how to declare and assign values to variables in JavaScript. Here’s a quick refresher:

Variable Declaration: In JavaScript, you can declare a variable using the `var`, `let`, or `const` keyword. For example:

“`javascript
var myVariable;
“`

Variable Assignment: You can assign a value to a variable using the assignment operator (`=`). For example:

“`javascript
myVariable = 10;
“`

Now that we have a basic understanding of JavaScript variables, let’s see how we can use them in HTML.

Inline JavaScript: One way to use JavaScript variables in HTML is by embedding JavaScript code directly within the HTML markup using the `
```

In this example, we declare a variable called `myVariable` and assign it a value of `10`. We then use the `document.write()` method to display the value of the variable on the webpage.

External JavaScript File: Another approach is to separate your JavaScript code into an external file with a `.js` extension and include it in your HTML using the `
```

Inside the `script.js` file, you can declare and use variables just like in the inline JavaScript example. This approach helps keep your code organized and maintainable, especially for larger projects.

Manipulating HTML Elements with JavaScript Variables

Using JavaScript variables, you can also manipulate HTML elements on your webpage. This allows you to dynamically update the content, style, or behavior of elements based on user interactions or other events.

Accessing HTML Elements: To interact with HTML elements using JavaScript, you need to identify them using unique IDs or classes. For example, if you have a `