What is JavaScript?
- JavaScript was designed to add interactivity
to HTML pages
- JavaScript is a scripting language
- A scripting language is a lightweight
programming language
- JavaScript is usually embedded directly into
HTML pages
- JavaScript is an interpreted language (means
that scripts execute without preliminary compilation)
- Everyone can use JavaScript without purchasing
a license
Are Java and JavaScript the same?
NO!
Java and JavaScript are two completely different
languages in both concept and design!
Java (developed by Sun Microsystems) is a
powerful and much more complex programming language - in the same category as C
and C++.
What can a JavaScript do?
- JavaScript gives HTML designers a
programming tool - HTML authors are normally not programmers, but
JavaScript is a scripting language with a very simple syntax! Almost anyone
can put small "snippets" of code into their HTML pages
- JavaScript can put dynamic text into an
HTML page - A JavaScript statement like this: document.write("<h1>"
+ name + "</h1>") can write a variable text into an HTML
page
- JavaScript can react to events - A
JavaScript can be set to execute when something happens, like when a page
has finished loading or when a user clicks on an HTML element
- JavaScript can read and write HTML elements
- A JavaScript can read and change the content of an HTML element
- JavaScript can be used to validate data - A
JavaScript can be used to validate form data before it is submitted to a
server. This saves the server from extra processing
- JavaScript can be used to detect the
visitor's browser - A JavaScript can be used to detect the visitor's
browser, and - depending on the browser - load another page specifically
designed for that browser
- JavaScript can be used to create cookies
- A JavaScript can be used to store and retrieve information on the
visitor's computer
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