Javascript

javascript JavaScript is an object-oriented scripting language originally developed by Netscape Communications under the name LiveScript but then renamed to “JavaScript” and given a syntax closer to that of Sun Microsystems’ Java language. JavaScript was later standardized by ECMA under the name ECMAScript. The current standard (as of December 1999) is ECMA-262 Edition 3, and corresponds to JavaScript 1.5. Microsoft calls their version JScript.The change of name from LiveScript to JavaScript happened at roughly the same time Netscape was including support for Java technology in its Netscape Navigator browser. Consequently, the change proved a source of much confusion. There is no real relation between Java and JavaScript; their only similarities are some syntax and the fact that both languages are used extensively on the World Wide Web.JavaScript is an object-oriented scripting language that connects through interfaces called Document Object Models (DOMs) to applications,especially to the server side (web servers) and the client side Web browser of internet applications.Many web sites use client-side JavaScript technology to create powerful dynamic web applications.It may use Unicode and can evaluate regular expressions (introduced in version 1.2 in Netscape Navigator 4 and Internet Explorer 4).JavaScript expressions contained in a string can be evaluated using the eval function.One major use of JavaScript is to write little functions that are embedded in HTML pages and interact with the DOM of the browser to perform certain tasks not possible in static HTML alone, such as opening a new window, checking input values, changing images as the mouse cursor moves over etc.Unfortunately, the DOMs of browsers are not standardized, different browsers expose different objects or methods to the script, and it is therefore often necessary to write different variants of a JavaScript function for the various browsers.JavaScript/ECMAScript is implemented by: KJS Rhino SpiderMonkeyEnvironmentThe Internet media type for JavaScript source code is text/javascript.To put JavaScript code in an HTML page, precede it with The comment markup is required in order to ensure that the code is not rendered as text by browsers which do not recognize the