how to call external javascript function in html

Okay, let's dive into the process of calling external JavaScript functions within your HTML, complete with explanations, examples, and best practices.

**The Core Concept: Linking JavaScript and HTML**

The fundamental principle is that you need to *connect* your HTML document to your external JavaScript file. This connection allows your HTML to "know" where to find the JavaScript functions you want to use.

**Steps and Techniques**

1. **Create Your JavaScript File (The `.js` File)**

* This is where you'll define your JavaScript functions.



2. **Create Your HTML File (The `.html` File)**

* This is your webpage's structure and content.
* You'll link to the JavaScript file here.



3. **The `script` Tag: The Linking Mechanism**

* The `script` tag is the heart of connecting HTML to JavaScript.
* The `src` attribute within the `script` tag specifies the path to your external JavaScript file.
* **Important:** The `src` attribute *must* point to the correct file path. Common errors here include:
* Typos in the filename.
* Incorrect relative paths (e.g., the file is in a subdirectory).
* Missing file extension (`.js`).

4. **Placement of the `script` Tag**

* **Option 1: Inside the `head`:** This is often used when the JavaScript code *modifies the DOM* (Document Object Model) as soon as the page loads, or when the code is responsible for handling events that occur early in the page loading process. If your JavaScript depends on elements that are rendered later in the `body`, you might encounter errors because those elements haven't been created yet.



* **Option 2: Just Before the Closing `/body` Tag:** This is generally the **recommended** approach for most cases. Placing the `script` tag at the ...

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