Menu
Home
People
Places
Arts
History
Plants & Animals
Science
Life & Culture
Technology
Reference.org
JavaScript syntax
open-in-new
<p>The <a href="/facts/Syntax_/zM5oInza">syntax</a> of <a href="/facts/JavaScript/XhhIIEsl">JavaScript</a> is the set of rules that define a correctly structured JavaScript program. </p><p>The examples below make use of the log function of the console object present in most browsers for <a href="/facts/Standard_streams/r92M7Wd4">standard text output</a>. </p><p>The JavaScript <a href="/facts/Standard_library/g9QS3vy0">standard library</a> lacks an official standard text output function (with the exception of document.write). Given that JavaScript is mainly used for <a href="/facts/Client-side_scripting/psjqGKBx">client-side scripting</a> within modern <a href="/facts/Web_browser/2pfyymLs">web browsers</a>, and that almost all Web browsers provide the alert function, alert can also be used, but is not commonly used. </p>