Pure JavaScript

var

JavaScript 1.0, JScript 1.0, ECMAScript 1.0 NES2+, Nav2+, IE3+, Opera3+ Syntax

var variable
var variable = value
						

Description

The var keyword is used to declare variables within a script. If it is used in a function, the scope of the variable is confined to that function. If used outside of a function, it is not limited and can be accessed anywhere on the page.

Example

Listing 6.270 declares the variable, myVar, in three different locations. It is declared once at a global level, once within a function where it is the returned value, and once in a function where it is written to the page. The result of running this script is shown in Figure 6.20.

Figure 6.20. Results of running Listing 6.270 in a browser.

Listing 6.270 This Example ...