javascript
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JavaScript
A popular programming language that is supported in all Web browsers and other Web tools. It enables interactive functions to be added to Web pages, which are otherwise static. JavaScript...
Dictionary
Definition: JavaScript
A popular programming language that is supported in all Web browsers and other Web tools. It enables interactive functions to be added to Web pages, which are otherwise static. JavaScript evolved from Netscape's LiveScript language.
JavaScript Vs. Java
JavaScript is embedded into Web pages, and because it is executed merely by retrieving a page from any Web site, it cannot be used to probe the computer's resources. Java is a full-blown programming language that can manipulate any resource in the computer. However, both JavaScript routines and Java programs (applets) activated from a Web page are "sandboxed" and do not have full reign of the machine.
Although there are commonalities, JavaScript is not a subset of Java, but it can be used in conjunction with it. For example, a JavaScript script could be used to display a data entry form and validate the input, while a Java applet or Java servlet processes the information.
No Bytecode in JavaScript
Unlike Java, JavaScript programs are not compiled into an intermediate bytecode language. JavaScript source code remains intact between Begin-Script and End-Script HTML tags in the Web page. Along with myriad other functions, JavaScript is used to enable interactive page elements such as navigation buttons and drop-down menus. It is also used to identify the page to analytics servers that capture traffic statistics. See JScript, Dojo, Java, Java applet, servlet and VBScript.
JavaScript Is Always Visible
JavaScript source code embedded in a Web page is easily viewed in any browser, in this example the Opera browser on a Mac. The blue text is HTML, which is the Web page rendering language, and the brown text is JavaScript. The combination of HTML and JavaScript causes navigation buttons to change color when the mouse rolls over them and to jump to another page when clicked. See HTML.
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