Internet & Web Technology, Programmimg Languages

JavaScript

JavaScript is a scripting language used to enable programmatic access to objects within
other applications. It is primarily used in the form of client-side JavaScript for the
development of dynamic websites. JavaScript is a dialect of the ECMAScript standard
and is characterized as a dynamic, weakly typed, prototype-based language with firstclass
functions. JavaScript was influenced by many languages and was designed to look
like Java, but to be easier for non-programmers to work with.

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!

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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