17.JavaScript

JavaScript is a prototype-based scripting language that is dynamic, weakly typed and has first-class functions. It is a multi-paradigm language, supporting object-oriented, imperative, and functional programming styles.

JavaScript was formalized in the ECMAScript language standard and is primarily used in the form of client-side JavaScript, implemented as part of a Web browser in order to give enhanced user interfaces and dynamic websites. This enables programmatic access to computational objects within a host environment.

JavaScript's use in applications outside Web pages—for example in PDF documents, site-specific browsers, and desktop widgets—is also significant. Newer and faster JavaScript VMs and frameworks built upon them (notably Node.js) have also increased the popularity of JavaScript for server-side web applications.

JavaScript uses syntax influenced by that of C. JavaScript copies many names and naming conventions from Java, but the two languages are otherwise unrelated and have very different semantics. The key design principles within JavaScript are taken from the Self and Scheme programming languages.

JavaScript is used in billions of Web pages to add functionality, validate forms, communicate with the server

Some of the important feature of JAVA SCRIPT

JBrowser Detection

·         Detecting the browser used by a visitor at your page. Depending on the browser, another page specifically designed for that browser can then be loaded. 

Cookies

·         Storing information on the visitor's computer, then retrieving this information automatically next time the user visits your page. This technique is called "cookies". 

Control Browsers

·         Opening pages in customized windows, where you specify if the browser's buttons, menu line, status line or whatever should be present.

Validate Forms

·         Validating inputs to fields before submitting a form.

An example would be validating the entered email address to see if it has an @ in it, since if not, it's not a valid address.

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