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  1. 123

    JavaScript functions are essential for adding interactivity and dynamic behavior to web pages. A function in JavaScript is a block of code designed to perform a specific task, and it is executed when "something" invokes it (calls it). Functions can be defined, called, and used in various ways within an HTML document.

    Defining a JavaScript Function

    A JavaScript function is defined using the function keyword, followed by a name, parentheses (), and a block of code enclosed in curly braces {}. The parentheses may include parameter names separated by commas. Here is an example of a simple function that calculates the product of two numbers:

    function multiply(a, b) {
    return a * b;
    }
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    Calling a JavaScript Function in HTML

    There are several ways to call a JavaScript function from an HTML document:

    Using Script Tags

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  2. W3School
    https://www.w3schools.com › js › js_functions.asp

    JavaScript Function Study Path - W3Schools

    A JavaScript function is defined with the function keyword, followed by a name, followed by parentheses (). Function names can contain letters, digits, underscores, an…
    Function Invocation

    The code inside the function will execute when "something" invokes(calls) the function: 1. When an event occurs (when a user clicks a button) 2. When it is invoked (called) from JavaScript code 3. Automatically (self invoked) You will lear…

    Function Return

    When JavaScript reaches a returnstatement, the function will stop executing. If the function was invoked from a statement, JavaScript will "return" to execute the code after the invoking statement. Functions often compute a ret…

    The () Operator

    The () operator invokes (calls) the function: Accessing a function with incorrect parameters can return an incorrect answer: Accessing a function without () returns the function and not the function result:

    Functions Used as Variable Values

    Functions can be used the same way as you use variables, in all types of formulas, assignments, and calculations.

  3. GeeksForGeeks
    https://www.geeksforgeeks.org › ... › how-to-call-javascript-function-in-html

    How to call JavaScript function in HTML - GeeksforGeeks

    Jun 9, 2024 · In HTML, you can easily call JavaScript functions using event attributes like onclick and onload. Just reference the function name within these attributes to trigger it.

  4. html-tuts.com
    https://html-tuts.com › how-to-call-a-javascript-function-in-html

    The Best Ways to Call a JavaScript Function in HTML

    • See More

    Dec 1, 2022 · To call a JS function in HTML, use the script tag in the document body. Placing the script in the head section can degrade performance. Another way is to use the script source attribute (src) …

  5. Stack Overflow
    https://stackoverflow.com › questions

    How to call a JavaScript function within an HTML body

    Is there a specific reason why you're creating the table with JavaScript instead of just in the HTML?

    • Reviews: 3
    • Mozilla Developer
      https://developer.mozilla.org › en-US › docs › Web › JavaScript › Guide › Funct…

      Functions - JavaScript | MDN

        • Defining functions. Function declarations. A function definition (also called a function declaration, …
        • Calling functions. Defining a function does not execute it. Defining it names the function and …
        • Function scope. Variables defined inside a function cannot be accessed from anywhere outside the …
        • Scope and the function stack. Recursion. A function can refer to and call itself. There are three …
        • Closures. Closures are one of the most powerful features of JavaScript. JavaScript allows for the …
        See full list on developer.mozilla.org
    • Delft Stack
      https://www.delftstack.com › ... › call-a-javascript-function …

      How to Call a JavaScript Function Into an HTML Body

      Feb 26, 2025 · This article explains how to call a JavaScript function in an HTML file or body. Discover various methods, including inline event handlers, …

    • agirlamonggeeks.com
      https://agirlamonggeeks.com › how-to-call-a-javascript-function-in-html

      How Do You Call a JavaScript Function in HTML?

      Learn how to call a JavaScript function in HTML effortlessly with step-by-step examples. This guide covers different methods to trigger functions using events like clicks and page loads.

    • BrowserStack
      https://www.browserstack.com › guide › calling-javascript-…

      How to call JavaScript function from HTML?

      Jul 16, 2025 · Learn how to call JavaScript functions from HTML using events, attributes, and examples to make your web pages interactive.

    • A Simple Guide to HTML
      http://www.simplehtmlguide.com › javascript.php

      JavaScript in HTML - A Simple Guide to HTML

      JavaScript in HTML - Learn how to include or embed javascript in your web page, handle basic mouse events, and see some basic example scripts.

    • TutorialsPoint
      https://www.tutorialspoint.com › article › how-to-call-a-javascript...

      How to call a JavaScript function in HTML? - Online Tutorials Library

      In this article, we will explore how to call and initialize JavaScript functions from HTML templates. JavaScript functions allow us to execute desired operations and respond to user interactions on web …

      • The Knowledge Academy
        www.theknowledgeacademy.com › JavaScript
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