JavaScript Introduction

JavaScript Introduction

JavaScript is the most popular programming language in the world.
This page contains some examples of what JavaScript can do.

JavaScript Can Change HTML Content
One of many HTML methods is getElementById().
This example uses the method to "find" an HTML element (with id="demo"), and changes the element content (innerHTML) to "Hello JavaScript":

Example
document.getElementById("demo").innerHTML = "Hello JavaScript";

JavaScript Can Change HTML Attributes
This example changes an HTML image, by changing the src attribute of an <img> tag:

JavaScript Can Change HTML Styles (CSS)
Changing the style of an HTML element, is a variant of changing an HTML attribute:

Example
document.getElementById("demo").style.fontSize = "25px";

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