Introduction 1
JavaScript (JS) is an interpreted computer programming language. It was originally implemented as part of web browsers so that client-side scriptscould interact with the user, control the browser, communicate asynchronously, and alter the document content that was displayed.
JavaScript is a prototype-based scripting language that is dynamic, weakly typed, and has first-class functions. Its syntax was influenced by the language 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. It is a multi-paradigmlanguage, supporting object-oriented,imperative, and functional programming styles.
JavaScript's use in applications outside of 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 was formalized in the ECMAScript language standard and is primarily used as part of a web browser (client-side JavaScript). This enablesprogrammatic access to computational objects within a host environment.
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