JavaScript
JavaScript is a cross-platform, object-oriented scripting language. It is a small and lightweight language. Inside a host environment (for example, a web browser), JavaScript can be connected to the objects of its environment to provide programmatic control over them.javaScript is a programming language used to make web pages interactive. It runs on your visitor's computer and doesn't require constant downloads from your website.
JavaScript is a scripting language that is used to add interactivity and behaviors
to web pages, including these (just to name a few):
• Checking form entries for valid entries
• Swapping out styles for an element or an entire site
• Making the browser remember information about the user for the next time she visits
• Building interface widgets, such as expanding menus
JavaScript is used to manipulate the elements on the web page, the styles applied to them, or even the browser itself. There are other web scripting languages, but JavaScript (also called ECMAScript) is the standard and most ubiquitous.
You may also hear the term DOM scripting used in relation to JavaScript.
DOM stands for Document Object Model, and it refers to the standardized list of web page elements that can be accessed and manipulated using JavaScript (or another scripting language). DOM scripting is an updated
term for what used to be referred to as DHTML (Dynamic HTML), now considered an obsolete approach.
Writing JavaScript is a type of programming, so it may be time-consuming to learn if you have no prior programming experience. Many people teach themselves JavaScript by reading books and following and modifying existing
examples. Most web-authoring tools come with standard scripts that you can use right out of the box for common functions.
Professional web developers are required to know JavaScript, however, plenty of visual designers rely on developers to add behaviors to their designs. So while JavaScript is useful, learning to write it may not be mandatory for all
web designers .
