JavaScript Syntax

The syntax of JavaScript is the set of rules that define a correctly structured JavaScript program. The examples below make use of the log function of the console object present in most browsers for standard text output. The JavaScript standard library lacks an official standard text output function (with the exception of document.write). Given that JavaScript is mainly used for client-side scripting within modern web browsers, and that almost all Web browsers provide the alert function, alert can also be used, but is not commonly used.

JavaScript Values

The JavaScript syntax defines two types of values:

• Fixed values
• Variable values

Fixed values are called Literals.
Variable values are called Variables.